We are offering to our customres a wide range of Glass Break Detector. Glass Break Detector has the capacity to detect glass breakages. It has a built-in transmitter to send an alarm signal, and has a built in back up battery. this is made by high quality raw material. this is also known for their durability and reliability. Customers can be easily grabbed from the market at affordable prcie. Dimension: Round = 3.4 in. diameter by 0.83 in. D (8.6 cm diameter by 2.1 cm D). Square = 3.4 in. H, 3.4 in. W, 0.83 in. D (8.6 cm H x 8.6 cm W x 2.1 cm D).