The Uni-Com Premium Rechargeable Door Chime has all the advantages of a portable chime unit without the added cost of having to replace batteries. The chime unit will last for over a week before the battery needs recharging, using the USB cable, and it will continue to operate whilst charging. It has an extensive wireless range of up to 150m this means the chime unit can be carried from room to room and outside into the garden to ensure a visitor is never missed. The weather-resistant bell push is easy to attach near your front door and is paired quickly to your chime unit. There are 3 operating modes: chime sound only, flashing light only and both together. The light only option is ideal for when children or shift workers are sleeping. The chime unit can be programmed to one of 8 enhanced chimes that include the Westminster chime or a traditional Ding Dong. The lens on the top of the chime unit is a flashing or steady chime alert which will illuminate in your chosen colour (red, blue or green). All Uni-Com door chimes work together and can be mixed and matched throughout your home. Bell Push powered by 1 x CR2032 button cell battery (supplied). Chime Unit powered by a built-in 3.7V 600mAh Li-ion rechargeable battery. Specification: Sound Output: 88 dBA Frequency: 433.92 MHz Chime Unit Dimensions (HxWxD): 130 x 63 x 30mm Bell Push Unit Dimensions (HxWxD): 82 x 29 x 19mm Compliant with Directive 2014/53/EU (RED).