Widely Application for the Wireless Doorbell The wireless doorbell transmitter and receiver kits can be used for a variety of applications, both at home and at the office! Did you know the new application of the wireless doorbell? Elderly or Patient Care: The push button transmitter can be used for emergency call for the eldely or patient. It is battery powered, easy to access for them too. Morning Call for Children: Hassled to get the children up in the morning for school? Don't worry, just press the transmitter at your home, your kids will wake up on time, no more late for school. Perfect for home, shop, office: With our wireless doorbell, you ll never miss a visitor. Technical specifications: Receiver Operating Voltage: AC 110V/220V Power consumption of transmitter <10mW Wireless Range: 1000 ft maximum (Open Space) Internal Sounds: 60 Melody IP44 weatherproof & dustproof casing for outdoor use Volume range: 5 adjustable levels (0db to 110db) Button working temperature: -10f to 150f How to choose your tune: 1. Plug in the receiver, press the music button of the receiver to select tunes. 2. Press and hold the volume button for about 3-4 seconds, the LED indicator lights up, then press the transmitter. Each doorbell set has been paired, sometimes if the doorbell is stored for a long time, the pairing may fail, when it happens, please try the step 2 above. Suggestions: 1. Metal door will interfere with the signal and shorten the transmission range, please do not install the transmitter on the metal door. 2. Please place the receiver in areas away from refrigerator, microwave and other high-power appliances. 3. The transmitter is IP44 waterproof, but we recommend installing a waterproof cover for long-term use.