Uni-Com Plug-in Door Chimewith USB-A and USB-C ports plus handy shelf to hold your mobile phone while charging. Ideal for use around the home, plugs into any 13A socket around your home. The door chime is wireless, so no wiring is required, and with an extensive operating range of up to 200m, you never have to miss a visitor or delivery. The bell push is water resistant (IP44 rated) .It has three operating modes - chime sound only, blue LED alert light only and both together, you can set your Door Chime to operate exactly as you want it to. With 30 different chime melodies to choose from, 90dB (A) sound output with volume control and a flashing blue chime alert, you will always know when somebody is at your door. Bell push powered by 1 x CR2032 Button Cell Battery (supplied) .Compatible with all other Wireless Uni-Com door chimes.