The Uni-Com Portable Door Chime is ideal for use around the home/garden, it can be wall mounted or free-standing. The door chime is wireless, so no wiring is required, and with an extensive operating range of up to 150m, 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, 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, 85dB(A) sound output with volume control and a flashing colour change chime alert, you will always know when somebody is at your door. Chime unit powered by 3 x AA Batteries (not supplied). Bell push powered by 1 x CR2032 Button Cell Battery (supplied). Compatible with all other Wireless Uni-Com door chimes.