USB Wireless Smart Welcome Doorbell Three-speed Volume 38 Songs Melodies Doorbell For Home Bed Emergency Call

1The DingDong can be equipped with multiple buttons, and different buttons can be set with different ringtones to distinguish the front and rear doors A button can add multiple DingDong, and the living room and bedroom ring twice, so don't worry about not hearing it 2Working Principle: The transmitter is installed outside the door, the receiver is installed on the power socket, press the transmitter to ring the bell, the receiver immediately rings the bell 3Ultra Long Wireless Distance 150m reliable wireless range and strong signal penetration, never miss a visitor or delivery 438 Chimes and Tunes Select your favorite music by switching between previous and next tracks, choose the tune we like best 53 Adjustable Volume Levels 3 levels of volume, easy to switch according to different usage scenarios 6Easy to install Simply plug the doorbell receiver into the socket and paste the doorbell button onto the wall to complete the installation