Device profile · Specifications & compatibility
Shelly Flood S Gen4
Shelly · Water Leak Sensors · Model S4SN-0071Z
We may earn a commission from qualifying purchases through these links.
Prices and stock change often on Amazon, so we do not show them here. The button opens the current listing.
- Shelly Flood S Gen4 lists On Device Alert Sound; Water Leak Alerts; Matter.
- Check power requirements and whether the alert works independently of network connectivity.
Browse more from Shelly or explore all water leak sensors in our catalog.
- Recorded year
- 2026
- Recorded warranty
- 3 years
- Dimensions
- Ø77 x 23 mm
- Weight
- 70g
The details that shape your choice
Shelly Flood S Gen4 Quick Features
Start with these specifications, then check the full details and conditions below.
Make the differences clear
Which device fits your setup?
Choose another model to compare features, connections and requirements side by side.
From specification to decision
Shelly Flood S Gen4: Capabilities And Limitations
Based on listed specifications, not hands-on testing. Manufacturer sources are linked where checked.
What it offers
An on-device audible alert is listed as an additional notification route. Check power requirements and whether the alert works independently of network connectivity. Built-in buzzer, 3.5 sec on / 1.5 sec off during a flood alarm
View On Device Alert Sound details →Water-leak alerts are recorded as a supported monitoring event. Verify the notification path and any controller dependency. An alert alone does not close a water valve. Push notification plus local buzzer, with Intense, Normal and Economic alarm profiles
View Water Leak Alerts details →Matter support is listed, making it a candidate for a compatible Matter setup after model and feature checks. Verify the exact device type, firmware and features exposed in your chosen platform. Matter support is not proof of feature parity. Matter over Wi-Fi, and the device ships with the Matter firmware by default. Certified by the CSA as Shelly Flood S Gen4, certificate CSA25430MAT45954-24.
View Matter details →
What to consider
A sensing cable is listed as unavailable; plan placement around the supported sensing points. The box holds only the sensor, its CR123A battery and the printed guide. The probe is the triple stainless-steel pad on the underside, so there is no extendable cable like the one bundled with the Shelly Flood Gen4.
View Sensor Cable details →Tamper alerts are recorded as unavailable.
View Tamper Alerts details →Temperature alerts are recorded as unavailable.
View Temperature Alerts details →
Still needs verification
Confirm these details if they matter to your setup.
Questions About Shelly Flood S Gen4
Does Shelly Flood S Gen4 support a water-sensing cable?
No, according to the listed specifications. Check whether the cable is included, the maximum length and the areas it can cover. The box holds only the sensor, its CR123A battery and the printed guide. The probe is the triple stainless-steel pad on the underside, so there is no extendable cable like the one bundled with the Shelly Flood Gen4.
View Sensor Cable specifications →Does Shelly Flood S Gen4 sound an alert on the device?
A built-in buzzer provides a local alarm. Battery life depends on the selected alarm profile, connectivity and usage. Check power requirements and whether the alert works independently of network connectivity.
Source: Shelly Flood S Gen4 manufacturer product page · Checked 2026-10-04
View On Device Alert Sound specifications →Does Shelly Flood S Gen4 report water-leak alerts?
Yes, according to the listed specifications. Verify the notification path and any controller dependency. An alert alone does not close a water valve. Push notification plus local buzzer, with Intense, Normal and Economic alarm profiles
View Water Leak Alerts specifications →Does Shelly Flood S Gen4 support Matter?
Matter operates over Wi-Fi. Battery life depends on the selected alarm profile, connectivity and usage. Verify the exact device type, firmware and features exposed in your chosen platform. Matter support is not proof of feature parity.
Source: Shelly Flood S Gen4 manufacturer product page · Checked 2026-10-04
View Matter specifications →Does Shelly Flood S Gen4 work with Home Assistant?
Yes, according to the listed specifications. Check the exact integration and firmware. A catalog integration label does not establish local control, official support or available entities. Shelly names Home Assistant on the product page, and the official Shelly integration covers Gen4 devices over Wi-Fi
View Home Assistant specifications →Explore the full picture
Shelly Flood S Gen4 Specifications
Recorded catalog values. Expand notes for qualifications; unknown values are not treated as missing features.
6 of 28 fields matched to manufacturer documentation. Source checks apply only to the named model and stated scope. Other fields remain catalog data. How we verify specifications →
Included Accessories1 fields
| Sensor Cable | NoDetails & conditionsThe box holds only the sensor, its CR123A battery and the printed guide. The probe is the triple stainless-steel pad on the underside, so there is no extendable cable like the one bundled with the Shelly Flood Gen4. |
|---|
Features3 fields
| On Device Alert Sound | YesManufacturer sourceA built-in buzzer provides a local alarm. Shelly Flood S Gen4 manufacturer product page →
Battery life depends on the selected alarm profile, connectivity and usage. Document check only; not a hands-on test or verification of every regional or firmware variant. Details & conditionsBuilt-in buzzer, 3.5 sec on / 1.5 sec off during a flood alarm |
|---|---|
| On Device Alert Light | YesDetails & conditionsMulti-color LED button that reports pairing, Wi-Fi, cloud and OTA state |
| Automations | YesDetails & conditionsLocal automation actions that keep running without cloud access, plus 10 webhooks with 2 URLs each and MQTT. Scripting and schedules are not supported on this model. |
Alerts5 fields
| Water Leak Alerts | YesDetails & conditionsPush notification plus local buzzer, with Intense, Normal and Economic alarm profiles |
|---|---|
| Temperature Alerts | No |
| Freeze Temperature Alerts | No |
| Low Battery Alerts | YesDetails & conditionsShort beep (0.3 sec on, 5 sec off) once the battery level drops below 20% |
| Tamper Alerts | No |
Connectivity7 fields
| 2.4 GHz Wi-Fi | YesDetails & conditionsWi-Fi 6, 802.11 b/g/n/ax on 2401-2483 MHz |
|---|---|
| 5 GHz Wi-Fi | No |
| Bluetooth | YesManufacturer sourceBluetooth 5 LE is specified. Shelly Flood S Gen4 manufacturer product page →
Battery life depends on the selected alarm profile, connectivity and usage. Document check only; not a hands-on test or verification of every regional or firmware variant. Details & conditionsBluetooth 5 LE |
| Z Wave | No |
| Zigbee | Zigbee Hub requiredDetails & conditionsZigbee 3.0 over 802.15.4. Five rapid button presses switch the device between its default Matter firmware and Zigbee, and it then joins through a Zigbee hub. |
| Thread | No |
| Other | No |
Integrations6 fields
| Google Home | YesDetails & conditionsShelly lists the Google Smart Home Sensor State trait for this model |
|---|---|
| Alexa | NoDetails & conditionsAlexa has no water leak sensor type: the Matter Water Leak Detector has no Alexa capability mapping, and bridges such as SmartThings or Home Assistant cannot expose a moisture sensor either |
| Apple Home | YesDetails & conditionsVia Matter |
| SmartThings | YesDetails & conditionsShelly lists the SmartThings Battery and Water Sensor capabilities for this model |
| Home Assistant | YesDetails & conditionsShelly names Home Assistant on the product page, and the official Shelly integration covers Gen4 devices over Wi-Fi |
| Matter | YesManufacturer sourceMatter operates over Wi-Fi. Shelly Flood S Gen4 manufacturer product page →
Battery life depends on the selected alarm profile, connectivity and usage. Document check only; not a hands-on test or verification of every regional or firmware variant. Details & conditionsMatter over Wi-Fi, and the device ships with the Matter firmware by default. Certified by the CSA as Shelly Flood S Gen4, certificate CSA25430MAT45954-24. |
Power3 fields
| Wired | No |
|---|---|
| Battery Type | CR123AManufacturer sourcePower comes from a CR123A battery. Shelly Flood S Gen4 manufacturer product page →
Battery life depends on the selected alarm profile, connectivity and usage. Document check only; not a hands-on test or verification of every regional or firmware variant. Details & conditions1 x CR123A, included |
| Battery Life | 2 yearsManufacturer sourceThe stated battery life is up to two years. Shelly Flood S Gen4 manufacturer product page →
Battery life depends on the selected alarm profile, connectivity and usage. Document check only; not a hands-on test or verification of every regional or firmware variant. |
Sensors3 fields
| Water Leak | YesManufacturer sourceConductive pads detect water leaks. Shelly Flood S Gen4 manufacturer product page →
Battery life depends on the selected alarm profile, connectivity and usage. Document check only; not a hands-on test or verification of every regional or firmware variant. Details & conditionsLarge-surface triple-pad stainless-steel sensor, rated for clean and low-conductivity water such as condensation or distilled water. State is checked every 5 seconds. |
|---|---|
| Temperature | NoDetails & conditionsWater detection is the only entry under the sensors section of the official specification |
| Tilt | No |
How this device compares
Shelly Flood S Gen4 vs Other Similar Models
Statistical context from 34 water leak sensors in this catalog. These figures describe our recorded data, not independent measurements.
Recorded feature coverage
On Device Alert Light: 16 of 32 known answers are Yes
Features: 50% among explicit Yes/No answers; 2 of 34 devices have no resolved answer. Check the specifications for this model’s conditions.
Recorded feature coverage
On Device Alert Sound: 21 of 34 known answers are Yes
Features: 62% among explicit Yes/No answers; 0 of 34 devices have no resolved answer. Check the specifications for this model’s conditions.
Recorded feature coverage
Automations: 27 of 31 known answers are Yes
Features: 87% among explicit Yes/No answers; 3 of 34 devices have no resolved answer. Check the specifications for this model’s conditions.
Brand representation in this directory
3 of 34 models are from Shelly
Counts water leak sensors listed here, not sales or market share. Catalog inclusion does not imply a recommendation.
Side-by-side specification comparison
Compare Shelly Flood S Gen4 vs Similar Water Leak Sensors
See how Shelly Flood S Gen4 stacks up against other water leak sensors in this catalog. Compare specifications, compatibility and pricing.
Catalog specifications have not all been independently checked against manufacturer sources. Read our data and evidence methodology.