Long Range Signal works up to a maximum distance of 150 meters, easily penetrates all obstacles, no matter where you are in the house, you will not miss any guests. Using different codes of the same frequency will not interfere with any device. This wireless doorbell is suitable for warehouse, home, office, hotel, etc. 58 Melodies and 4-Volume Levels 58 melodies and 4 adjustable volume levels are available for selection and can be adjusted at will. The volume of the wireless doorbell ranges from 0dB to 85dB. IP44 Waterproof and Dustproof DoorbellThe wireless doorbell adopts IP44 weatherproof technology. Operates between -22 and 158, the wireless doorbell is also suitable for outdoor use. For example, it works perfectly in rain, snow or sub-zero temperatures. Flashing LEDWireless Doorbell Doorbell life is extended by 50% with voltage source constant. Ringtones (transmitters and receivers) have LED indicators, so if someone rings, each device flashes blue. An easy-to-use design for the elderly who are deaf or disabled. Easy to Install You can easily connect the doorbell receiver to a European power outlet. the transmitter can be screwed to the door frame or attached with double-sided tape.