【Long Range & Stronger Signal】Works within 300 meters in open space. The signal from this doorbell penetrates obstacles very effectively. You can connect the receiver anywhere in your home. No wireless interference. 【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 with the included screws or glued with the included adhesive. 【Excellent quality and IP44 waterproof】This doorbell is made of ABS material, non-toxic and safe. The transmitter has an IP44 waterproof rating and is suitable for outdoor use. It protects against dust, rain, and high temperatures. It does not emit electromagnetic radiation. CE certified. 【Energy saving and long life】Low power consumption, energy saving, and long life. The transmitter battery lasts more than 15 months. The transmitter supports over 100,000 clicks. 【LED Indicator】Both the doorbell (transmitter) and the receivers have LED indicators. If