More convenient when an alarm input is triggered, SMS alarm messages are sent to 6 predefined phones. Safer, all inputs (from S1 to S8) are shorted to GND and activated on alarm. More personalized, the alarm can be customized with your SMS text, compatible with SMS alarm, phone call alarm. Easier size of GSM smartbox and very thin, can be easily mounted into a target panel to add GSM alarm functions. Easier size of GSM smartbox and very thin, can be easily mounted into a target panel to add GSM alarm functions. GSM alarm system GSM home alarm system wireless GSM alarm system GSM alarm system GSM alarm system home alarm system 'GSM alarm GSM SMS alarm system GSM SMS alarm kit call warning mini SMS kit 8ch call warning Features: Voltage: 5V DC. Channels: 8. Model: GA09. Communication Interface: Wireless. Alarm Type: SMS. Equipment Configuration: Door/Window Sensors. Operating Frequency: GSM (2G) 850/900/1800/1900 MHz. Dimensions: 6.6 x 6.2 x 2.2 cm. Package Weight: 94g. Contents: 1 GA09 alarm box antenna. 1 cable with connector