Self-powered: 1 plug-in receiver, 1 transmitter. Compared to traditional wireless doorbells, you won't need to worry about dead batteries with our battery-free wireless doorbell kit. High Performance: Wireless doorbell works up to 1000 feet/300m, under temperatures between -20°C to +55°C, withstands extreme weather conditions, ensure that you won't miss the arrival of a visitor even if you are far from the door. Doorbell with IP44 waterproof design, weatherproof and designed for outdoor use. 36 Different Melodies & 4-Level Volume: Easily choose by pressing the button on the receiver. The wireless doorbell 4 Adjustable volume levels 0dB-85dB. Enjoy pleasant melodies every time someone rings your doorbell. Memory function: The wireless doorbell can It remembers your last melody choice and the selected volume after a power outage; no need to reset your previous settings, practical and easy-to-use device for better user convenience. Easy to install: The wireless home doorbell Simply plug