Wide Range Wireless Range- With strong wireless signals up to 500M in your home or business in an open space. The transmitter (button) has a strong penetrating power. You'll never miss a visitor's arrival wherever you are. Since the signal code of each wireless doorbell is different, it will not interfere with other devices in your home or neighbors IP55 Waterproof Design- The transmitter can operate in temperatures between -10C and 60C (14F up to 140F). IP55 waterproof, the transmitter (button) can withstand the baptism of rain and harsher climates, you can put it outside the door. Visual Signal- The circular LED light of the receiver flashes, which leads to an ideal set up for the hearing impaired and the elderly. Illuminated buttons help visitors find the doorbell at night and let you know if your doorbell is working ...