gsm security alarm system Saful G3 doorbell Intelligent home

Specifications
1. Wireless frequency: 315/433/868/915MHz,2262/1.5-4.7M,EV1527/300K
2. GSM frequency: 900/1800/850/1900MHz (quad band)
3. Standby Current:<25mA, Alarm current:<450mA
4.Power requirements: AC110V ~AC 240V, 50Hz/60Hz
Working consumption:< 0.6W
Backup battery: DC7.4V/850MA
Backup battery working hours: =8 hours
5. Working condition
temperature: -30°C~+60°C
humidity: =95% (non-condensation)
6. Siren loudness:15-110dB
7. Record time: 10s http://www.doorbellalarm.com/
gsm security alarm system Saful G3 doorbell Intelligent home