【Long Range & Stronger Signal】Working within 300 meters in an open space, the signal of this doorbell can penetrate obstacles well. You can connect the receiver anywhere in your home. No wireless interference problem. 【Super Easy Installation】The receiver requires no assembly or batteries, just plug it into a power outlet. The transmitter can be attached to the front door using the provided screws or stuck to the door using the provided adhesive. 【Excellent Quality & IP44 Waterproof】This doorbell is made of ABS material, which is non-toxic and safe. The transmitter is IP44 waterproof and suitable for outdoor use. Dustproof, rainproof, and high temperature resistant. No electromagnetic radiation. CE certified. 【Energy saving and long service life】Low power consumption, energy saving and durable. The transmitter battery can be used for more than 15 months. The transmitter can withstand more than 100,000 clicks. 【LED indicator light】Both the doorbell (transmitter) and receiver have LED