Can remotely notify WIFI signals. When fire smoke is detected, an alarm will be issued and notifications will be sent through the mobile app Use 2 AA battery (not included) for power supply, long endurance 360 degree all-round detection, instantly triggering an alarm One button self check/mute to check whether it works normally and can be cancelled High volume alarm, up to 85dB during alarm Battery undervoltage alarm prompt, when the battery voltage is lower than the rated value, transmit the APP to remind the user to replace the battery Rotating and detachable top cover design for easy on-site cleaning and battery replacement Specifications: Working voltage: DC9V Detection angle: 360 Detection distance: 150 meters Transmission frequency: 433MHZ Working voltage: 3V Standby current: 5uA Alarm current: 600mA Battery type: 2 x AA battery (not included) Alarm sound: 85dB (within 15cm) Applicable scope: family, hotel, factory, apartment, shopping mall Installation method: SMT Launch distance: 200 meters Action distance: 12 mm Wi Fi: IEEE 802.11 b/g/n 2.4G 433 Transmission: RF433.92