Dahua DHI-ARD512-W2(868) Wireless glass breakage detector. The Wireless Glass Break Detector recognizes multiple low and high frequencies of breaking glass. There are 2 zone inputs for connecting wired devices. 2-Way wireless communication, Frequency Hopping, Battery; 1x CR123A, Dimensions (hxwxd) 107,8 x 34,5 x 24,8mm.