Shelly Plus Smoke - smart smoke detector

Shelly Plus Smoke - smart photoelectric smoke detector

Device identification

• Device name: Shelly Plus Smoke

• Device model: SNSN-0031Z

• Device SSID: ShellyPlusSmoke-XXXXXX

---

Short description

Shelly Plus Smoke is a smart photoelectric smoke detector that is effective at detecting slow, smouldering fires — for example, when a lit cigarette is left on a sofa or bed.

---

Features

• Battery powered

• LED indicator

• Low battery warning

• Alarm silencing (Hush mode)

• Test function

• Easy installation

• Compliant with DIN EN 14604

---

Main applications

• Private households

---

Connectivity

• Wi-Fi

• Bluetooth

💡 Both connection types can be enabled or disabled by the user.

---

User interface

Input

• One button

Button actions:

• Press and hold for 3 seconds – device test

• Short press – silences the alarm

• Short press 3x – setup mode (for 2 minutes)

• Short press 5x – factory reset (followed by setup mode for 2 minutes)

---

Outputs

LED indicator

Status	LED
Normal operation	Red LED flashes once every 53 seconds
Test	3 red LED flashes
Alarm	Continuous red LED flashing
Fault	Red LED flashes twice every 53 seconds
Silenced alarm	Red LED flashes once every 10 seconds
Low battery	Red LED flashes every 53 seconds (with sound)
Silenced low battery	Red LED flashes every 53 seconds (no sound)
Setup mode (activation)	Green LED flashes rapidly
Setup mode (active for 2 minutes)	Green LED flashes slowly

Audible signal (built-in buzzer)

Action	Sound
Button press	1 short beep
Test	3 short beeps
Alarm	Continuous loud beeps
Low battery warning	1 short beep every 53 seconds

---

Technical specifications

Physical characteristics

• Dimensions (diameter x height): 86x31 ±0.5 mm / 3.39x1.22 ±0.02 in

• Weight: 95 ±1 g / 3.35 ±0.05 oz

• Mounting: Ceiling

• Housing material: Plastic

• Colour: White

• Service life: 10 years

Environmental conditions

• Operating temperature: 0 °C to 55 °C / 32 °F to 131 °F

• Humidity: 30% to 95% RH

Electrical characteristics

• Power supply (AC): Not required

• Power supply (DC): 1x 3 V CR123A / CR17335 battery

• Battery life: Up to 5 years (with original battery)

Sensors

• Smoke sensor: Photoelectric

Radio

• RF frequency band: 2400–2495 MHz

• Max. RF output power: <20 dBm

• Wi-Fi protocol: 802.11 b/g/n

• Wi-Fi range:

  • Indoors up to 30 m / 100 ft

  • Outdoors up to 50 m / 160 ft (depending on environment)

• Bluetooth protocol: 4.2

• Bluetooth range:

  • Indoors up to 10 m / 33 ft

  • Outdoors up to 30 m / 100 ft (depending on environment)

Microcontroller (MCU)

• CPU: ESP32-U4WDH

• Flash memory: 4 MB

---

Software capabilities

• Webhooks (URL actions): 10 (up to 2 URLs each)

• Scripting: No

• MQTT: Yes

• CoAP: No

User manual: Shelly Plus Smoke multilingual printed user and safety guide.pdf Manufacturer's website: Shelly Plus Smoke