Multi-function Wireless Guard Against Theft&Alarm System Feature: Composed by infrared explorer and receiver(Host computer). Adopt to wireless transfers. Dispatch distance:>600m. The explorer will send out wireless hertzian waves when the theft enter the Infrared supervisory district.The receiver will give an alarm at once and reveal the direction. 1&3 is Police wagon voice.2&4 is fire engine voice.It can distinguish the direction from the voice if with two explorer.It?s adopt to password transfer message between Explorer and Receiver. This Explorer Alarm systerm can be powered by DC(1x9Vbattery can use 1-3months).And can be powered by AC. The receiver can be powered by AC/DC. It?s easy for end user. With stable performance. Application:comprehensive application.such as courtyard,community,factory...and so on.