Battery-controlled, low-power alarm.Wide input voltage supply from 5 V DC to 15 V DC. Each alarm can be configured with different contents independently. SMS will be sent to a maximum of 6 pre-installed mobile phones when any alarm is triggered. Fully 8 input signals and you can select the input port as NC or without mode for signaling. It is used in home security, warehouse security, remote unmanned areas, security. Specification: Condition Colour:black Material:ABS plastic Size:66 x 62 x 22mm Package Contents: 1 x GSM Alarm 1 x Antenna 1 x Cable Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.