Long Range Up to 1000 Feet (300 m) in open space: Ensure that you never miss any important guests or urgent deliveries even if you are several rooms away. This wireless doorbell works perfectly in the kitchen, bedroom, living room and so on. High Performance Transmitter: Ultra-low power consumption, uses 23a12v alkaline battery that boasts 2 year maximum lifespan, IP44 dustproof and waterproof, working temperature ranges from -4 °F-140 °F, withstands various harsh weather conditions. 38 Melodies with 3-Level of Adjustable Volume: Press the music button to easily choose from 38 melodies, 3 adjustable volume levels, with a maximum volume of 110 dB, enjoy pleasant melodies whenever someone rings at your door. Memory Function: Preserve your last set melody after a power outage; no need to reset to your previous settings; Convenient and easy to use design for a better user experience. If paired with multiple push units in one system, the chime can be set individually for each push unit. Easy Installation: Just plug the receiver into a wall outlet, install the push button with provided double sided tape or screw it on the wall (screws are included).