GL09 8 Channel Battery Operated App Control GSM Alarm Systems SMS Alert Security System Features: Powered by battery, support low power quantity alarm. Each alarm SMS can be customized with different content by yourself. SMS alarm message would be sent to maximum 6 preset mobile phones when any alarm input triggered. Totally 8 alarm input and you can select the input port as NC or NO mode to alarm. It is used in home security, warehouse safety protection, remote unmanned sites, security protection. Specification: Condition: Material: ABS plastics Color: Black Size: 66 * 62 * 22mm/2.6 * 2.4 * 0.9in Package Weight: Approx. 160g/5.6oz Package List: 1 * GSM Alarm 1 * English Manual 1 * Antenna 1 * Cable Note: 1. Please allow 0-1 inch error due to manual measurement, thanks for your understanding.