The outdoor wireless siren adopts 8 bit MCU technology. Built-in two wired zones, alarm light and status light, as well as high decibel buzzer, showing voice and light indication for arm/disarm/alarm status. Either through wireless transmission and wireless alarm host supporting the use to be supporting the use by cable transmission and engineering network alarm master, but also as a site alarm host. Widely used in banks, shops and villas and other places, work with alarm host, not only can prompt Host arm / disarm state, when alarm there is high decibel noise output and light flashing, when the trigger signal will make intruder fled the scene, Strengthening alarm deterrence and improve the environment to prevent security system. When the wireless siren work with wireless alarm host by wireless transmission ,alarm host can input the wireless siren address, or directly learning with the Wireless siren. Wireless siren tamper alarm ,AC information, battery voltage information via wireless signal transmission to the alarm host, then alarm host and via SMS, center, voice to notify the user corresponding alarm to process. Wireless siren also can indicate alarm host arm / disarm status. Wireless siren work with engineering network alarm host by wired transmission, wireless siren can indicate alarm host arm/disarm status of real-time. This wireless siren can also be used as an independent alarm host, according to different needs, customers can add corresponding remote control and detectors, and learning these wireless accessories with wireless siren.