The smoke detector support flashing warning, sound warning and APP warning, which can let you know the fire alarm as soon as possible. The smoke detector features high sensitivity, which can quickly detect smoke occurred at the beginning of a fire disaster and keep you from danger. Made of ABS material, the smoke detector is lightweight, eco-friendly and durable to use. It supports WiFi connection, which is more convenient to use. The length of the smoke detector is 5.5cm and thickness is 5.1cm. The smoke detector is suitable for being used in living room, bedroom, kitchen and so on. Item Name: Smoke Detector Material: ABS Battery: 1 x CR2, 3V Battery Life: More Than 3 Years Quiescent Current: 11uA Alarm Current: 30mA Working Conditions: -10 Degrees Celsius-50 Degrees Celsius Alarm Type: Flashing Sound, Alarm Sound, APP Alarm Sound: >85dB (3m) RF: 2.4G/WIFI Features: Mini, Sensitive, Loud Size Details: 5.1cm x 5.5cm/2.01" x 2.17" (Approx.) Notes: Due to the light and the screen setting difference, the item's color may slightly differs from the pictures. Please allow slight dimension difference due to the manual measurement. Package Includes: 1 x Smoke Detector 1 x User Manual