Specifications Product name: Smart Smoke Sensor Model: SF30 Size: Φ90*37mm Working voltage: 3V (CR123A battery) Standby current: < 6uA Alarm current: < 30mA Low voltage warning: 2.6V ± 0.2V Alarm sound pressure: 80dB / 3M Networking method: Zigbee Wireless networking distance: ≤80 meters (front 3m) Working environment: -10 ℃ ~ + 55 ℃ Ambient humidity: maximum 95% RH Installation method: Ceiling