Wireless vibrating burglar alarm buzzer

MD-325R - Wireless Outdoor Sound and Light Siren / External Siren MD-325R is wireless outdoor siren with 4PCS A size battery inside. It can work with any of our wireless alarm host, able to work in dual way or one way. there are two frequency for choice, 433 or 868mhz. when alarm, both strobe and alarm sound up to 110 db will alert the people around.    The installation is very easy, the user do not need to add any external power adaptors,it is totally wire-free.   Features: supports 15 wireless equipments work with alarm control panel, wireless PIR detector, wireless door/window detector etc… dual-way communicate with wireless alarm control panel high alarm volume aound 110dB sound for 2.5 minutes when alarm had been triggered on arm status sound indication for arm / disarm battery power supply  wireless emitting / receiving distance 100m (in open area) wireless emitting power 14±1dB wireless emitting frequency: 433MHz / 868MHz