The Uni-Com Portable & Plug-In Door Chime Twin Pack immediately extends the coverage around your home and garden to ensure a visitor is never missed. The extensive wireless range of up to 120m means the portable chime unit can be carried from room to room and outside into the garden. Whilst the plug-in chime unit can be inserted into any 13A socket and placed in any room around the home or in a detached office at the back of your garden. The weather-resistant bell push is easy to install and quickly pairs with your chime unit. The chime unit can be programmed to one of 8 chimes, including: Westminster chime, traditional Ding Dong or a Barking Dog for increased security. 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). Portable Chime Unit powered by 2 x AA batteries (not supplied). Specification: Sound Output: 85 dBA Frequency: 433.92 MHz Portable Chime Unit Dimensions (HxWxD): 98 x 64 x 36mm Plug-In Chime Unit Dimensions (HxWxD): 98 x 64 x 40mm Bell Push Unit Dimensions (HxWxD): 80 x 30 x 18mm Compliant with Directive 2014/53/EU (RED).