Long range and stronger signalWorks within 300 meters in open space, the signal of this doorbell penetrates obstacles very well. You can connect the receiver anywhere you want in your home. No wireless interference issues. Super Easy SetupThe receiver requires no assembly or batteries, just plug it into an electrical outlet. The transmitter can be attached to the front door with the included screws or stuck to the door with the included adhesive. Excellent quality and waterproof IP44This doorbell is made of ABS material, non-toxic and safe. The transmitter is IP44 waterproof and acceptable for outdoor use. Protects against dust, rain and high temperatures. No electromagnetic radiation. Energy saving and long lifespanLow power consumption, energy saving and durable use. The transmitter battery can be used for more than 15 months. The transmitter can support more than 100,000 times clicking. LED IndicatorThe doorbell (transmitter) and receivers have LED indicators, if someone presses the doorbell, all devices will flash in blue light. 36 melodies available, 5 volume levels adjustable from 0 dB to 85 dB.