【Anti-interference】wireless doorbell digital circuit design, a range using the same doorbell, but also will not interfere with each other, using wireless high-frequency transmitting technology, the same frequency and different code, effectively avoiding mutual interference between neighbors and the trouble caused by misfiring. 【300m signal reception】doorbell penetration performance, receiving distance from the open space straight line distance can reach 300 meters, the actual reception signal depending on the environment, due to different obstacles signal different 【3 volume and 38 music】humanized design, adjustable volume and music, easy to install and use (default ding dong ding dong) 3 adjustable volume, 38 music optional, suitable for family use, with music doorbell instead of knocking 【IP44 waterproof】The wireless doorbell transmitter is designed to meet the IP44 waterproof standard , which prevents rainwater intrusion and effectively extends the service life of the product 【Easy to install】Wireless doorbell can be set up without any wiring or experience, the receiver is installed indoors and can be plugged in, press the button and the bell will ring indoors