Features: 1.Message push setting. When the emergency button is pressed, it is transmitted to the cloud through the gateway(not included), and then the message is pushed to the mobile APP. 2.Linkage control. When the emergency button is pressed, the added lights and curtains, etc, are turned on or off according to the first set method. 3.Low battery alarm. When the battery is too low, automatically push a message to the APP. Record for the record. Real?time record the use of the alarm, save 7 days of historical records (automatic coverage). 4.For Tuya Zigbee smart smoke alarm can be remotely controlled by a mobile phone and can be connected to other for Tuya?supporting products in the home. It must be used together with the zigbee 3.0 gateway (not included). 5.It has a wide range of applications and is widely used in homes, hotels, hospitals, nursing homes and other places that need it. Specification: Item Type: SOS Button_x000D_ Material: ABS_x000D_ Size: Approx. 52 x 17.3mm/2.0 x 0.7in_x000D_ Operating Voltage: DC 3V_x000D_ Wireless Type: ZigBee_x000D_ Alarm Current: 25mA_x000D_ Static Current: 5mA_x000D_ Power Supply: 1 x CR2032 button battery, 100mAh (built-in battery)_x000D_ Battery Life: More than 1 year_x000D_ Low \Voltage Alarm: 2.5V 0.2V_x000D_ Communication Distance: More than approx. 50m/54.7yd in the open space_x000D_ Operating Temperature: -10 - 50 PackageList: 1 x SOSButton 1 xLanyard 1 xManual