BIKUL 【No Battery Required】Wireless Doorbell,Push Button Self-powered Transmitter Waterproof Flashing Door Bell, AC100-240V Receiver, 38 Chimes 5 Volume Levels (UK Plug)

【No Battery Required】-- When your finger presses the doorbell transmitter, the kinetic energy is converted into electric energy, & the doorbell transmitter can transmit wireless signals. No battery is needed, & there is no need to change the battery of the doorbell.
【38 Melodies, Flash LED Light】-- Wireless doorbells for home has 386 Melodies and 5 levels of volume range . The built-in big LED indicator offer additional assistance for the hearing impaired.
【Long Operating Range Up to 200m】 -- Wireless doorbells the strong wireless signal is up to 200m in open area, will not interfere with other equipment in your home or those of your neighbors.
【Easy Installation】--Easy to install button sticks well to any surface or use the screws to secure the button to the door frame, just plug in & you are set to go. No Battery Required for Receiver. The bells also flash blue lights so even with headphones on they are visible.
【Multi Use】--The door bell ringer wireless can be set up in seconds. The mini waterproof doorbell chime is suitable for home, office, classroom, shop and the place where master should be told the vistor come.