【Long Range & Stronger Signal】Working within 300 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 requires no assembly or batteries, just plug it into an electrical outlet. The transmitter can be attached 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 temperatures. 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 withstand more than 100,000 times of clicking. 【LED indicator】Both the doorbell (transmitter) and