Physen Diamond Wireless Doorbell Sound with Waterproof Doorbell Pushbutton,52 Melodies and 500 Feet Operation Rang Vintage Doorbell System(2 Chime Receivers,1 Transmitter Button White) 1)Housing:Simple diamond surface that seamlessly shows you high-end visual effect; ABS material with attributes of high rigidity ,anti-burn and impact resistance 2)Touching button:Weatherproof Touching button can be mounted indoors and outdoors instead of most non water-proof buttons in the market , moreover touching button enhance your experience 3)Operating range :500 feet (1000 feet in open area),wireless range may vary depending on construction and materials.Also remember do not mount the pushbutton on metal materials 4)Ring volume&tones: 4 levels volume adjustable (from 25db to 85db), 52 (16 chord) elegant chimes allow you to change the tune with your mood as well as set tune to a specific receiver chime 5)No wiring required to install the product. Just plug the receiver in the wall, and mount the wireless transmitter using the supplied double sided tape or mounting screws and that's it, CE, FCC, RoHS certified