Shelly Flood Gen4

Device identification

Name: Shelly Flood Gen4

Model: S4SN-0071A

Device SSID: ShellyFloodG4-XXXXXXXXXXXX

BLE Model ID: 0x1822

Short description

Shelly Flood Gen4 is a smart leak detection sensor that alerts you immediately when water is detected where it
shouldn’t be—under appliances, sinks, or along pipes. Featuring an innovative extendable leak sensor cable that
covers large areas (up to 150 m), it ensures wide protection against flooding. The device provides instant
notifications, local buzzer alerts, and supports multiple connectivity options (Wi-Fi, Zigbee, Bluetooth, and Matter).
Its IP44-rated housing ensures reliable operation even in humid environments.

Main features

• Leak detection for small or large areas via extendable sensor cable (up to 150 m)
• Two modes: Flood Detection and Rain Detection
• Three alarm profiles: Intense, Normal, and Economic
• Instant notifications and built-in buzzer alerts
• Battery-powered operation
• IP44 protection for humidity and dust resistance
• Compatible with major automation systems
• Local actions for standalone operation
• Supports Shelly Cloud and Shelly Smart Control app

Use cases

• Immediate flood detection: Receive alerts when water is detected under sinks, appliances, or in basements
• Home protection: Place near water heaters, dishwashers, or washing machines to prevent damage
• High-risk area monitoring: Install in kitchens, bathrooms, or laundry rooms for continuous leak detection
• Automatic appliance shutoff: Pair with smart relays to stop water supply when a leak occurs
• Pipe leak detection: Run the cable along pipes to detect moisture early

Main applications

• Residential
• MDU (apartments, condos, hotels)
• Light commercial (offices, retail, restaurants, gas stations)
• Government/municipal
• University/college
• Farming

Integrations

Amazon Alexa supported capabilities: Contact Sensor

Google Smart Home supported traits: Sensor State

Samsung SmartThings supported capabilities: Battery, Water Sensor

Simplified internal schematics

Flood-Gen4-internal-schematics-1.png

Connectivity

Wi-Fi

Bluetooth

Zigbee

Matter

Accessories

Shelly Leak Sensor Cable – included with Shelly Flood Gen4.
3D-printable cable holders are available for customized installations.

Safety function

Overheating protection

Overvoltage protection

Overcurrent protection

Supported load types

• Not applicable (sensor device)

User interface

Inputs: LED Button

• Press once → wakes device for 3 min, LED on, reports state

• Press once → reports flood component status

• Double-press → sleep mode

• Triple-press → Zigbee inclusion mode (3 min active)

• Press 5× → switch between Matter and Zigbee firmware

• Hold 5 s → network reset (LED flashes slowly; auto-cancels after 3 min)

• Hold 10 s → factory reset

Outputs: Buzzer & LED indications



Buzzer patterns:

• Long beep (3.5 s ON / 1.5 s OFF) → Flood detected

• Short beep (0.3 s ON / 5 s OFF) → Low battery (< 20%)



LED color meanings:

• Blue → AP mode enabled

• Red → STA mode active, not connected to Wi-Fi

• Yellow → Connected to Wi-Fi, Cloud disabled or not connected

• Green → Connected to Wi-Fi and Shelly Cloud

• Flashing Purple → Zigbee commissioning mode

• Flashing Red/Blue → OTA update in progress

• Flashing Yellow → Identification mode (for locating device)

Alarm modes

Flood Detection Mode: Triggers an immediate alarm and notifications when water is detected.


Rain Detection Mode: Reports water presence without triggering an alarm — ideal for non-critical use.

Physical

Size (HxWxD): 97×76×25 mm / 3.82×2.99×0.98 in

Weight: 91 g / 3.21 oz (without batteries); 185 g / 6.53 oz (with batteries)

Mounting: Wall

Shell material: Plastic

Shell color: White

Environmental

Ambient temperature: −20 °C to 40 °C (−5 °F to 105 °F)

Humidity: 30–70% RH

Max altitude: 2000 m (6562 ft)

Electrical

Power supply: Batteries

Battery type: 4× AA 1.5 V

Estimated battery life: Approx. 2 years (depends on battery type, device usage, and network conditions)

Sensors & Meters

Leak sensor cable: 2 m, extendable up to 150 m; attaches via designated port

Radio

Wi-Fi protocol: 802.11 b/g/n/ax

Wi-Fi RF band: 2401–2483 MHz

Wi-Fi max RF power: < 20 dBm

Wi-Fi range: Up to 30 m / 100 ft indoors; 50 m / 160 ft outdoors (depends on conditions)



Bluetooth protocol: 5 (LE)

Bluetooth RF band: 2402–2480 MHz

Bluetooth max RF power: < 20 dBm

Bluetooth range: Up to 10 m / 33 ft indoors; 30 m / 100 ft outdoors (depends on conditions)



Zigbee protocol: 802.15.4

Zigbee RF band: 2405–2480 MHz

Zigbee max RF power: < 20 dBm

Zigbee range: Up to 100 m / 328 ft indoors; 300 m / 984 ft outdoors (depends on conditions)

MCU

CPU: ESP-Shelly-C68F

Flash: 8 MB

Firmware capabilities

Schedules: No

Webhooks: 10 (up to 2 URLs each)

Scripting: No

MQTT: Yes

UDP: Yes

KVS (Key-Value Store): Yes