SECRUI Door Chime, Door Open Sensor Chime for Business/Home When Entering, Adjustable Volume, Easy Installation, 400ft Range, 52 Chimes, M508+D7

【Easy to install】:Just plug the doorbell receiver into any standard outlet and tear the double- sided adhesive tape which on the back of door sensor( or screw mounted) and stick them to the door or window is fine,please take the insulating paper away before using the sensor
【24/7 Lifeguard for Your Family】: This child/ home door sensor alerts when burglar opens door and helps deter break-ins(entry alert chime activates when magnetic sensor separates)
【Adjustable Volume Control & 52 Chimes Options】:5 levels of adjustable volume from 0-110 dB.Offer 52 elegant music from the traditional”Ding Dong” to various well know chimes.Memory function: Keep the previous setted tune after re-plugging it