Shelly Plus Smoke Alarm
What is Shelly Plus Smoke Alarm?
Shelly Plus Smoke Alarm is a smart photoelectric smoke alarm, which is effective at detecting slow fires that smoulder for hours before bursting into flame. Receive instant notifications on your phone and create safety scenes to keep your family and home safe.
Features

Wi-Fi & Bluetooth connectivity
Connect Shelly Plus Smoke to your Wi-Fi network. No HUB required!

5 years of battery life
Count on low-battery-consuming technology.

Sound & light alerts
If smoke is detected, Shelly Plus Smoke will initiate a loud sound (>85db) and light alarm.

Easily mountable
Shelly Plus Smoke is wire-free and has no angle limitations, making it very easy to install.

Immediate notification
No matter where you are, Shelly Plus Smoke will immediately notify you of any danger.

Smart scenes
Set custom scenes by combining Shelly Plus Smoke with your other Shelly devices
Inputs
- One push button
- Press and hold for 3 sec to test the Device.
- Press briefly to silence an alarm.
- Press briefly 3 times to put the Device in Setup mode for 2 minutes.
- Press briefly 5 times to factory reset. Device stays in Setup mode for 2 minutes.
Outputs
- LED indication
- Normal operation: Red light flashes once every 53 seconds.
- Testing: 3 red light flashes.
- Alarm: Continuous red light flashes.
- Malfunction: Red light flashes twice every 53 seconds
- Hushed alarm: Red light flashes once every 10 seconds.
- Low battery warning: Red light flashes once every 53 seconds.
- Hushed low battery warning: Red light flashes once every 53 seconds (with no sound).
- Device in Setup mode: Green light flashes quickly.
- Device in Setup mode for 2 minute: Green light flashes slowly.
- Buzzer
- Button pressed: 1 short beep.
- Testing: 3 short beeps.
- Alarm: Continuous loud beeps.
- Low battery warning: Short beep once every 53 seconds.
Specifications
PHYSICAL | |
---|---|
Size (HxWxD): | 86x86x31 ±0.5 mm / 3.39x3.39x1.22 ±0.02 in |
Weight: | 95 ±1 g / 3.35 ±0.05 oz |
Mounting: | Ceiling |
Shell material: | Plastic |
Color: | White |
ENVIRONMENTAL | |
Ambient temperature: | -0 °C to 55 °C / 32 °F to 131 °F |
Humidity: | 30 % to 95 % RH |
Max. altitude: | 2000 m / 6562 ft |
ELECTRICAL | |
Power supply voltage AC: | N/A |
Power supply voltage DC: | 1x 3 V CR123A battery |
Battery life: | 5 years |
SENSORS, METERS | |
Smoke sensor: | Photoelectric |
RADIO | |
RF band: | 2401 - 2495 MHz |
Max. RF power: | <20 dBm |
Wi-Fi protocol: | 802.11 b/g/n |
Wi-Fi Range: | Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors (Depends on local conditions) |
Bluetooth Protocol: | 4.2 |
Bluetooth Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors (Depends on local conditions) |
MCU | |
CPU: | ESP32 |
Flash: | 4 MB |
FIRMWARE CAPABILITIES | |
Webhooks (URL actions): | 10 with 2 URLs per hook |
Scripting: | No |
MQTT: | Yes |
CoAP: | No |
Installation of Shelly devices must be done by a qualified electrician or authorised installers.
Use Cases

Immediate notifications

Sends an immediate notification and sounds alarm

Cuts off power supply to all appliances

Notifies you if anyone is in the room

Turns on emergency lighting and unlocks all doors
