【Long range and stronger signal】Works within 300 meters in an 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 problem. 【Super easy installation】The receiver requires no assembly or batteries, simply plug it into an electrical outlet. The transmitter can be attached to the front door with the screws provided or stuck to the door with the included adhesive. 【Excellent quality and waterproof IP44】This 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 temperature. No electromagnetic radiation. CE certified. 【Energy saving and long life】Low power consumption, energy saving and durable in use. The transmitter battery can be used for more than 15 months. The transmitter can support more than 100,000 times of clicking. 【LED indicator】The doorbell (transmitter) and receivers have