Cheap Elderly Guard GSM Medical Alarm System with Big SOS Button L&L-B10

Feature: 
1. Adopt GSM 850/900/1800/1900 bands, can be used all over the world. 
2. Can per-set 5 phone numbers: When there is an alarm, it will call these numbers in order. Press DISARM button on the main panel, it will stop alarming. 
3. Can per-set 5 SMS numbers: When there is an alarm, it will send SMS to these numbers. 
4. Maximum 30 wireless sensors including wireless panic button or remote controllers, etc. 
5. 2 wired ports to connect wired sensors. 
6. The SMS content of the first 5 wireless sensors can be edited by users. 
7. Support remote listen in and two-way communication (connect an external speaker). 
8. SMS alert for power failure or recovery. 
9. Built-in backup rechargeable battery to keep working after power off. 

Technical Parameters: 
1. Power: DC 12V / 1.2A 
2. Status Current: ≤ 30mA 
3. GSM band: 850/900/1800/1900 MHZ 
4. Wireless receiving frequency: 433 MHZ± 0.5MHZ 
5. Receiving code: ASK 
6. Wireless distance: No obstacle 80m 
7. Working Temperature: -10° C~+45° C 
8. Working humidity: ≤ 90% 
9. Back-up battery: 7.4V / 500mAh