1When any alarm input is triggered, SMS alarm messages will be sent to up to six preset phones. 2Any input from S1 to S8) is a shorted to GND and activates the alarm. 3GSM Intelligent box size and very thin, can be easily mounted in a Panel of target system to add the characteristics of GSM Alarm. 4The Alarm can be customized with your SMS text, compatible with SMS Alarm, Alarm of telephone call. 5We can Customize the design of the GSM Alarm Box according to their requirements for free.Features: When any alarm input is triggered, SMS alarm messages will be sent to up to six preset phones.Any input (from S1 to S8) 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: DC6V 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: Approx.6.6 x 6.2 x 2.2cm/2.6 x 2.4 x 0.8in Package Weight: 94g/3.3oz Package List: 1 x GA09 Alarm Box Antenna 1 x Cable with a Connector Piece } Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.