Features: When any alarm input is triggered, SMS alarm messages will be sent to up to six preset phones. Any input is a shorted to GND and activates the alarm. GSM Intelligent box size and very thin, can be easily mounted in a Panel of target system to add the characteristics of GSM Alarm. The Alarm can be customized with your SMS text, compatible with SMS Alarm, Alarm of telephone call. We can Customize the design of the GSM Alarm Box according to their requirements for free. Specifications: Voltage: DC5V Channels: 8 Model: GA09 Communication interface: wireless Alarm Type: SMS Equipment Configuration: Door/Window Sensors Working frequency: GSM (2G) 850/900/1800/1900 MHz Size: 6.6*6.2*2.2cm/2.6*2.4*0.8in Package Weight: 94g/3.3oz Package List: 1 * GA09 Alarm Box Antenna 1 * Cable with a Connector Piece