GSM siren alarm 1. Blue/red light, 20-30w 2. Adopt GSM 850/900/1800/1900, per-set 5 number to send text when alarm alert 3. 120db speaker 4. Built-in rechargeable battery 5. Support 433 A&B 6. When user press A in the remote control. Strobe and siren must activated and send sms to 5 users 7. Work in quad band Show More