The Smart Device Compare comparison

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug vs TP-Link Kasa EP40

Understand the differences. Decide what matters to your home.

Before you compare every specification

Key differences between Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug and TP-Link Kasa EP40

A summary of selected recorded differences between these plugs. Check the full specification table below for details and conditions.

Feature differences among your selected devices

2.4 GHz Wi-Fi (connectivity): Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — No; TP-Link Kasa EP40 — Yes.
Zigbee Router (features): Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — Yes (Works as a Zigbee router while powered on and connected, repeating signal to extend the network, with support for up to 64 end devices); TP-Link Kasa EP40 — No.
Energy Monitoring (power): Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — Yes (Real-time voltage, current, power and consumption with historical reports by hour, day and month, 180 days of consumption history and data export); TP-Link Kasa EP40 — No.

Specifications to check side by side

Zigbee (connectivity): Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — Zigbee Hub required (Zigbee 3.0 (IEEE 802.15.4) device: it pairs to a Zigbee coordinator such as a SONOFF ZBBridge, a SONOFF Dongle with ZHA or Zigbee2MQTT, or the built-in coordinator of an Amazon Echo Plus, Echo 4th gen or Echo Show 2nd gen); TP-Link Kasa EP40 — No.
Apple Home (integrations): Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — SONOFF Hub required (The device is not a native HomeKit accessory: it reaches the Apple Home app through a Matter bridge, either a SONOFF hub (Bridge-M, ZBBridge-U, iHost) or the software Matter bridge in eWeLink CUBE); TP-Link Kasa EP40 — No (The Kasa HomeKit line covers the EP25, EP40A, KS200 and KS220; the standard EP40 is not among them and its own page lists only Alexa and Google Assistant).
Matter (integrations): Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — SONOFF Hub required (The device is not Matter itself: SONOFF republishes it into Matter through a bridge (Bridge-M, ZBBridge-U, iHost or eWeLink CUBE with a SONOFF Zigbee Dongle), which is how it reaches the Apple Home app); TP-Link Kasa EP40 — No (The Matter-certified version of this outdoor plug is the separate EP40M model; the EP40 is Wi-Fi only).
Load Voltage (power): Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — 100 - 125V; TP-Link Kasa EP40 — 110 - 125V.

Information still to confirm

1 of 22 comparison fields lack a resolved value for at least one selected device. Missing information is not evidence that a feature is absent.
Check the full table and manufacturer documentation before ruling out a device.

These observations are derived from recorded catalog data and have not all been independently verified. Confirm details with the manufacturer before purchasing.

Compare capabilities, compatibility and setup requirements.

Option 1 · Sonoff

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug

Last updated October 2026

View full device profile

Option 2 · TP-Link

TP-Link Kasa EP40

Last updated October 2026

View full device profile

What the catalog tells us

Understand the tradeoffs.

These counts describe the available data, not a quality score. More features do not automatically make a better device.

7differences with recorded values for every device

1rows with missing or unspecified information

Consider your setup

Apple Home

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart PlugSONOFF Hub required
TP-Link Kasa EP40No

Confirm which features appear in Apple Home and whether extra hardware or a subscription is needed for your intended use.

Inspect the specifications

Consider your setup

Matter

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart PlugSONOFF Hub required
TP-Link Kasa EP40No

Confirm the exact device type and the features exposed in your chosen platform. Protocol support does not establish feature parity across apps.

Inspect the specifications

Your priorities, side by side

Focus on what changes.

Mark the specifications you care about. Open manufacturer sources for verification scope; fields without citations remain catalog data. Expand notes for other qualifications.

Differences onlyMy priorities (0)

Showing 22 of 22 rows. “Not recorded” does not mean “No”.

Reading layout

Connectivity

2.4 GHz Wi-Fi

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: No
TP-Link Kasa EP40: Yes

5 GHz Wi-Fi

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: No
TP-Link Kasa EP40: No

Bluetooth

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: No
TP-Link Kasa EP40: No

Thread

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: No
TP-Link Kasa EP40: No

Z Wave

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: No
TP-Link Kasa EP40: No

Zigbee

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Zigbee Hub required
Catalog note
Zigbee 3.0 (IEEE 802.15.4) device: it pairs to a Zigbee coordinator such as a SONOFF ZBBridge, a SONOFF Dongle with ZHA or Zigbee2MQTT, or the built-in coordinator of an Amazon Echo Plus, Echo 4th gen or Echo Show 2nd gen
TP-Link Kasa EP40: No

Features

Automations

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Yes
Catalog note
Schedules, timers, loop timers and inching, plus smart scenes triggered by load power or electricity consumption
TP-Link Kasa EP40: Yes
Catalog note
Independent schedules, countdown timers and sunrise/sunset offsets for each outlet through the Kasa Smart app

On Off Button

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Yes
Catalog note
One physical button: a single press toggles the load, a five second hold enters pairing mode and a ten second hold resets the device
TP-Link Kasa EP40: Yes
Catalog note
Two independent on/off buttons with their own status LEDs on the plug body

Zigbee Router

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug

Yes

Manufacturer source

Zigbee router functionality is described.

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — manufacturer product description →

Source section: Product description / feature descriptions
Model: S61SZBTPB
Region: Manufacturer listing for the named model/variant; regional equivalence has not been established
Firmware: Not specified by this source
Checked: 2026-10-04

Check the specified variant, required hub and installation instructions. Manufacturer claims are not independent performance tests.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

Works as a Zigbee router while powered on and connected, repeating signal to extend the network, with support for up to 64 end devices

TP-Link Kasa EP40

Integrations

Alexa

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Yes
Catalog note
Works over Alexa voice control through account linking in the eWeLink app, and the Amazon Echo Plus 2nd gen, Echo 4th gen and Echo Show 2nd gen can act as its Zigbee hub directly
TP-Link Kasa EP40: Yes
Catalog note
TP-Link lists Alexa voice control for the EP40 and its Amazon listing carries the Works with Alexa badge

Apple Home

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: SONOFF Hub required
Catalog note
The device is not a native HomeKit accessory: it reaches the Apple Home app through a Matter bridge, either a SONOFF hub (Bridge-M, ZBBridge-U, iHost) or the software Matter bridge in eWeLink CUBE
TP-Link Kasa EP40: No
Catalog note
The Kasa HomeKit line covers the EP25, EP40A, KS200 and KS220; the standard EP40 is not among them and its own page lists only Alexa and Google Assistant

Google Home

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Yes
Catalog note
Once the plug is added to a compatible SONOFF Zigbee gateway, the eWeLink app's account linking exposes it to Google Home for on and off voice control
TP-Link Kasa EP40: Yes
Catalog note
TP-Link lists Google Assistant voice control for the EP40 and the Kasa Smart app links the plug to Google Home

Home Assistant

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Yes
Catalog note
Supported natively through Zigbee2MQTT from version 2.11.0 and through ZHA with the SONOFF-provided script, using a SONOFF Dongle Plus, Dongle Lite, Dongle Max or ZBDongle
TP-Link Kasa EP40: Yes
Catalog note
The official Home Assistant TP-Link integration lists the EP40 among its supported Kasa devices

Matter

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: SONOFF Hub required
Catalog note
The device is not Matter itself: SONOFF republishes it into Matter through a bridge (Bridge-M, ZBBridge-U, iHost or eWeLink CUBE with a SONOFF Zigbee Dongle), which is how it reaches the Apple Home app
TP-Link Kasa EP40: No
Catalog note
The Matter-certified version of this outdoor plug is the separate EP40M model; the EP40 is Wi-Fi only

SmartThings

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Yes
Catalog note
Listed as SmartThings compatible with an AeoTec Smart Home Hub V3 as its Zigbee hub, and reachable through the eWeLink cloud once added to a SONOFF gateway
TP-Link Kasa EP40: Yes
Catalog note
TP-Link Kasa Smart is a Works with SmartThings partner for outlets and the line pairs through TP-Link account linking in the SmartThings app

Power

Energy Monitoring

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug

Yes

Manufacturer source

Power and energy measurement are described.

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — manufacturer product description →

Source section: Product description / feature descriptions
Model: S61SZBTPB
Region: Manufacturer listing for the named model/variant; regional equivalence has not been established
Firmware: Not specified by this source
Checked: 2026-10-04

Check the specified variant, required hub and installation instructions. Manufacturer claims are not independent performance tests.

Document check only; not a hands-on test or verification of every regional or firmware variant.

Catalog note

Real-time voltage, current, power and consumption with historical reports by hour, day and month, 180 days of consumption history and data export

TP-Link Kasa EP40

Load Voltage

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: 100 - 125V
TP-Link Kasa EP40: 110 - 125V

Maximum Load Current

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: 15A
TP-Link Kasa EP40: 15A

Maximum Load Power

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: 1875W
TP-Link Kasa EP40: 1875W

Overheat Overload Protection

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Yes
Catalog note
Multi-layer protection: the plug shuts the load off immediately when a configured current, voltage or power threshold is exceeded, and it can be restored remotely or manually after a trip
TP-Link Kasa EP40: Not recorded

Plug Format

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: Type B
TP-Link Kasa EP40: Type B

Usb Charging

Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug: No
TP-Link Kasa EP40: No

Specifications for Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug versus TP-Link Kasa EP40
Specification	Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug	TP-Link Kasa EP40
Connectivity
2.4 GHz Wi-Fi	No	Yes
5 GHz Wi-Fi	No	No
Bluetooth	No	No
Thread	No	No
Z Wave	No	No
Zigbee	Zigbee Hub required Catalog note Zigbee 3.0 (IEEE 802.15.4) device: it pairs to a Zigbee coordinator such as a SONOFF ZBBridge, a SONOFF Dongle with ZHA or Zigbee2MQTT, or the built-in coordinator of an Amazon Echo Plus, Echo 4th gen or Echo Show 2nd gen	No
Features
Automations	Yes Catalog note Schedules, timers, loop timers and inching, plus smart scenes triggered by load power or electricity consumption	Yes Catalog note Independent schedules, countdown timers and sunrise/sunset offsets for each outlet through the Kasa Smart app
On Off Button	Yes Catalog note One physical button: a single press toggles the load, a five second hold enters pairing mode and a ten second hold resets the device	Yes Catalog note Two independent on/off buttons with their own status LEDs on the plug body
Zigbee Router	Yes Manufacturer source Zigbee router functionality is described. Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — manufacturer product description → Source section Product description / feature descriptions Model S61SZBTPB Region Manufacturer listing for the named model/variant; regional equivalence has not been established Firmware Not specified by this source Checked 2026-10-04 Check the specified variant, required hub and installation instructions. Manufacturer claims are not independent performance tests. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Works as a Zigbee router while powered on and connected, repeating signal to extend the network, with support for up to 64 end devices	No
Integrations
Alexa	Yes Catalog note Works over Alexa voice control through account linking in the eWeLink app, and the Amazon Echo Plus 2nd gen, Echo 4th gen and Echo Show 2nd gen can act as its Zigbee hub directly	Yes Catalog note TP-Link lists Alexa voice control for the EP40 and its Amazon listing carries the Works with Alexa badge
Apple Home	SONOFF Hub required Catalog note The device is not a native HomeKit accessory: it reaches the Apple Home app through a Matter bridge, either a SONOFF hub (Bridge-M, ZBBridge-U, iHost) or the software Matter bridge in eWeLink CUBE	No Catalog note The Kasa HomeKit line covers the EP25, EP40A, KS200 and KS220; the standard EP40 is not among them and its own page lists only Alexa and Google Assistant
Google Home	Yes Catalog note Once the plug is added to a compatible SONOFF Zigbee gateway, the eWeLink app's account linking exposes it to Google Home for on and off voice control	Yes Catalog note TP-Link lists Google Assistant voice control for the EP40 and the Kasa Smart app links the plug to Google Home
Home Assistant	Yes Catalog note Supported natively through Zigbee2MQTT from version 2.11.0 and through ZHA with the SONOFF-provided script, using a SONOFF Dongle Plus, Dongle Lite, Dongle Max or ZBDongle	Yes Catalog note The official Home Assistant TP-Link integration lists the EP40 among its supported Kasa devices
Matter	SONOFF Hub required Catalog note The device is not Matter itself: SONOFF republishes it into Matter through a bridge (Bridge-M, ZBBridge-U, iHost or eWeLink CUBE with a SONOFF Zigbee Dongle), which is how it reaches the Apple Home app	No Catalog note The Matter-certified version of this outdoor plug is the separate EP40M model; the EP40 is Wi-Fi only
SmartThings	Yes Catalog note Listed as SmartThings compatible with an AeoTec Smart Home Hub V3 as its Zigbee hub, and reachable through the eWeLink cloud once added to a SONOFF gateway	Yes Catalog note TP-Link Kasa Smart is a Works with SmartThings partner for outlets and the line pairs through TP-Link account linking in the SmartThings app
Power
Energy Monitoring	Yes Manufacturer source Power and energy measurement are described. Sonoff iPlug Gen2 S61s Type B Zigbee Power Meter Smart Plug — manufacturer product description → Source section Product description / feature descriptions Model S61SZBTPB Region Manufacturer listing for the named model/variant; regional equivalence has not been established Firmware Not specified by this source Checked 2026-10-04 Check the specified variant, required hub and installation instructions. Manufacturer claims are not independent performance tests. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Real-time voltage, current, power and consumption with historical reports by hour, day and month, 180 days of consumption history and data export	No
Load Voltage	100 - 125V	110 - 125V
Maximum Load Current	15A	15A
Maximum Load Power	1875W	1875W
Overheat Overload Protection	Yes Catalog note Multi-layer protection: the plug shuts the load off immediately when a configured current, voltage or power threshold is exceeded, and it can be restored remotely or manually after a trip	Not recorded
Plug Format	Type B	Type B
Usb Charging	No	No

Know what’s behind the comparison.

The table matches specifications by section and field. It preserves notes, separates missing data from explicit “No” values, and keeps qualifications attached to their values. No overall winner is assigned from feature counts.

Read our comparison methodology