USUPERINK Door Chime, Wireless Door Alarm Contact Sensor with Adjustable Volume LED Flash, 48 Chimes, Nightlight Function, Magnetic Door Chime for Business/Home/Office/Store, Pack of 4 - ZJKSDB03BELL-4PK+DM07-4PK

• Wireless door chime offers a generous detection area of nearly 400 feet. Far enough to cover every window and door in your house. Expand the system can pairing up to 32 wireless doorbell botton,magnetic sensors and infared sensor. It built-in 40 mm stereo speaker, there are 48 ringtones and 5 adjustable volume levels(included silent mode) to choose from. It is suitable for Private houses,Villas,Schools,Companies,Hospitals and etc. With the built-in LED indicator, the wireless door alert receiver and sensor offer additional assistance when coupled with the receiver to the hearing impaired. Difficulty hearing is no problem with our wireless doorbell. With its simple wireless plug-in and double-sided tape, the wireless door and window chime sets up in seconds. It gives you the opportunity to spend your time elsewhere. All hardware is included, and ready to use. IP 54 waterproof wireless push button works in temperature ranges from -22F to 158F, stands up to any weather so you can mount it anywhere outside without worrying. Come with one CR2032 battery, up to 10 years battery life (300,000 times of using), no need to replace battery almost.