Home Security Door/windows Magnetic Sensor Alarm Entry Alert Chime with Wireless Receiver (Blue) Transmitter:68x4816mm,receiver:69x104x23mm Wireless Receiver very sensitive,alert when the magnet set apart 10mm Sound up to 105dbs,36 pcs ringtones in storage;operating range(open area):200M Hight low volume adjustable. Factory 2 year quality warranty