The Smart Device Compare comparison

Eufy Entry Sensor E20 vs Ring Window and Door Contact Sensor (2nd gen)

Understand the differences. Decide what matters to your home.

Before you compare every specification

Key differences between Eufy Entry Sensor E20 and Ring Window and Door Contact Sensor (2nd gen)

A summary of selected recorded differences between these door & window sensors. Check the full specification table below for details and conditions.

Feature differences among your selected devices

Alexa (integrations): Eufy Entry Sensor E20 — No (The sensor is a HomeBase accessory: the eufy Security Alexa skill exposes cameras, doorbells, locks and arming, not the individual HomeBase sensors.); Ring Window and Door Contact Sensor (2nd gen) — Yes.

Specifications to check side by side

2.4 GHz Wi-Fi (connectivity): Eufy Entry Sensor E20 — HomeBase required (Links wirelessly to a US version of the eufy HomeBase (Mini, 2, 3 or Pro), which provides the WiFi connection. Open-air range to the HomeBase is up to 656 ft (200 m).); Ring Window and Door Contact Sensor (2nd gen) — No.
Z Wave (connectivity): Eufy Entry Sensor E20 — No; Ring Window and Door Contact Sensor (2nd gen) — Z-Wave Hub required.
Battery Life (power): Eufy Entry Sensor E20 — 5 years (eufy rates the single CR123A battery at up to 5 years of use.); Ring Window and Door Contact Sensor (2nd gen) — 3 years.
Battery Type (power): Eufy Entry Sensor E20 — CR123A; Ring Window and Door Contact Sensor (2nd gen) — 2x CR2032.

Information still to confirm

6 of 30 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 · Eufy

Eufy Entry Sensor E20

Last updated October 2026

View full device profile

Option 2 · Ring

Ring Window and Door Contact Sensor (2nd gen)

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.

5differences with recorded values for every device

6rows with missing or unspecified information

Consider your setup

Battery Life

Eufy Entry Sensor E205 years
Ring Window and Door Contact Sensor (2nd gen)3 years

Compare the stated test conditions. Catalog battery figures alone do not predict runtime in your home.

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 30 of 30 rows. “Not recorded” does not mean “No”.

Reading layout

Alerts

Door Window Alerts

Eufy Entry Sensor E20

Yes

Manufacturer source

Opening a door or window can trigger an alert.

Eufy Entry Sensor E20 manufacturer product page →

Source section: Model-specific product page summary
Model: Eufy Entry Sensor E20
Region: US manufacturer page; other regional variants are not verified by this source
Firmware: Not specified by this source
Checked: 2026-10-04

Battery life depends on usage.

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

Catalog note

Sends open/close alerts and can trigger HomeBase chimes, eufy camera recordings and automations when a door or window opens.

Ring Window and Door Contact Sensor (2nd gen)

Yes

Low Battery Alerts

Eufy Entry Sensor E20: Not recorded
Ring Window and Door Contact Sensor (2nd gen): Not recorded

Motion Alerts

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Tamper Alerts

Eufy Entry Sensor E20: Yes
Catalog note
eufy lists Tamper Protection as supported.
Ring Window and Door Contact Sensor (2nd gen): Yes
Catalog note
Ring documents resolving a tampered Contact Sensor (1st and 2nd Gens): the tamper switch sounds the Alarm siren and shows the Tampered indicator in the app

Temperature Alerts

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Connectivity

2.4 GHz Wi-Fi

Eufy Entry Sensor E20: HomeBase required
Catalog note
Links wirelessly to a US version of the eufy HomeBase (Mini, 2, 3 or Pro), which provides the WiFi connection. Open-air range to the HomeBase is up to 656 ft (200 m).
Ring Window and Door Contact Sensor (2nd gen): No

5 GHz Wi-Fi

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Bluetooth

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Other

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Thread

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Z Wave

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): Z-Wave Hub required

Zigbee

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Features

Automations

Eufy Entry Sensor E20: Yes
Catalog note
Create automation rules in the eufy app (v6.0.00 or above) to activate eufy cameras or lights when the sensor triggers.
Ring Window and Door Contact Sensor (2nd gen): Not recorded

History Records

Eufy Entry Sensor E20: Not recorded
Ring Window and Door Contact Sensor (2nd gen): Not recorded

Minimum Detection Distance

Eufy Entry Sensor E20: 2 cm
Ring Window and Door Contact Sensor (2nd gen): Not recorded

Ota

Eufy Entry Sensor E20: Not recorded
Ring Window and Door Contact Sensor (2nd gen): Not recorded

Sensitivity

Eufy Entry Sensor E20: Not recorded
Ring Window and Door Contact Sensor (2nd gen): Not recorded

Integrations

Alexa

Eufy Entry Sensor E20: No
Catalog note
The sensor is a HomeBase accessory: the eufy Security Alexa skill exposes cameras, doorbells, locks and arming, not the individual HomeBase sensors.
Ring Window and Door Contact Sensor (2nd gen): Yes

Apple Home

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Google Home

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Home Assistant

Eufy Entry Sensor E20: Yes
Catalog note
The community eufy-security-client integration (installed through HACS) lists this exact model (T90E0, Entry Sensor E20).
Ring Window and Door Contact Sensor (2nd gen): Yes

Matter

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

SmartThings

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Power

Battery Life

Eufy Entry Sensor E20

5 years

Manufacturer source

The advertised battery life is up to five years.

Eufy Entry Sensor E20 manufacturer product page →

Source section: Model-specific product page summary
Model: Eufy Entry Sensor E20
Region: US manufacturer page; other regional variants are not verified by this source
Firmware: Not specified by this source
Checked: 2026-10-04

Battery life depends on usage.

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

Catalog note

eufy rates the single CR123A battery at up to 5 years of use.

Ring Window and Door Contact Sensor (2nd gen)

3 years

Battery Type

Eufy Entry Sensor E20: CR123A
Ring Window and Door Contact Sensor (2nd gen): 2x CR2032

Sensors

Door Window

Eufy Entry Sensor E20: Yes
Catalog note
Magnetic contact sensor with dual-side detection: the magnet can sit on the left or right of the main unit, within about 0.8 inch (2 cm).
Ring Window and Door Contact Sensor (2nd gen): Yes

Light

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Motion

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Occupancy

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Temperature

Eufy Entry Sensor E20: No
Ring Window and Door Contact Sensor (2nd gen): No

Specifications for Eufy Entry Sensor E20 versus Ring Window and Door Contact Sensor (2nd gen)
Specification	Eufy Entry Sensor E20	Ring Window and Door Contact Sensor (2nd gen)
Alerts
Door Window Alerts	Yes Manufacturer source Opening a door or window can trigger an alert. Eufy Entry Sensor E20 manufacturer product page → Source section Model-specific product page summary Model Eufy Entry Sensor E20 Region US manufacturer page; other regional variants are not verified by this source Firmware Not specified by this source Checked 2026-10-04 Battery life depends on usage. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note Sends open/close alerts and can trigger HomeBase chimes, eufy camera recordings and automations when a door or window opens.	Yes
Low Battery Alerts	Not recorded	Not recorded
Motion Alerts	No	No
Tamper Alerts	Yes Catalog note eufy lists Tamper Protection as supported.	Yes Catalog note Ring documents resolving a tampered Contact Sensor (1st and 2nd Gens): the tamper switch sounds the Alarm siren and shows the Tampered indicator in the app
Temperature Alerts	No	No
Connectivity
2.4 GHz Wi-Fi	HomeBase required Catalog note Links wirelessly to a US version of the eufy HomeBase (Mini, 2, 3 or Pro), which provides the WiFi connection. Open-air range to the HomeBase is up to 656 ft (200 m).	No
5 GHz Wi-Fi	No	No
Bluetooth	No	No
Other	No	No
Thread	No	No
Z Wave	No	Z-Wave Hub required
Zigbee	No	No
Features
Automations	Yes Catalog note Create automation rules in the eufy app (v6.0.00 or above) to activate eufy cameras or lights when the sensor triggers.	Not recorded
History Records	Not recorded	Not recorded
Minimum Detection Distance	2 cm	Not recorded
Ota	Not recorded	Not recorded
Sensitivity	Not recorded	Not recorded
Integrations
Alexa	No Catalog note The sensor is a HomeBase accessory: the eufy Security Alexa skill exposes cameras, doorbells, locks and arming, not the individual HomeBase sensors.	Yes
Apple Home	No	No
Google Home	No	No
Home Assistant	Yes Catalog note The community eufy-security-client integration (installed through HACS) lists this exact model (T90E0, Entry Sensor E20).	Yes
Matter	No	No
SmartThings	No	No
Power
Battery Life	5 years Manufacturer source The advertised battery life is up to five years. Eufy Entry Sensor E20 manufacturer product page → Source section Model-specific product page summary Model Eufy Entry Sensor E20 Region US manufacturer page; other regional variants are not verified by this source Firmware Not specified by this source Checked 2026-10-04 Battery life depends on usage. Document check only; not a hands-on test or verification of every regional or firmware variant. Catalog note eufy rates the single CR123A battery at up to 5 years of use.	3 years
Battery Type	CR123A	2x CR2032
Sensors
Door Window	Yes Catalog note Magnetic contact sensor with dual-side detection: the magnet can sit on the left or right of the main unit, within about 0.8 inch (2 cm).	Yes
Light	No	No
Motion	No	No
Occupancy	No	No
Temperature	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