【Long Range & Stronger Signal】Works within 70 meters in open space, this doorbell's signal penetrates obstacles very well. You can connect the receiver anywhere you want in your home. No wireless interference problem. 【Super Easy Installation】The receiver does not require any assembly or batteries, just plug it into an electrical outlet. The transmitter can be fixed to the front door with the provided screws or stuck to the door with the included adhesive. 【Excellent Quality & IP44 Waterproof】This doorbell is made of ABS material, non-toxic and harmless. 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 service 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 click. 【LED indicator】Both the doorbell (transmitter) and receivers