The Uni-Com Smart Portable Door Chime can be wall mounted or free-standing around your home and garden. The extensive wireless range of up to 100m means that 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 install and quickly pairs with your chime unit. The chime unit can be programmed to one of 26 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).Chime Unit powered by 2 x AA batteries (not supplied). Specification: Sound Output: 95 dBAFrequency: 433.92 MHzChime Unit Dimensions (HxWxD): 11.5 x 6.5 x 3cmBell Push Unit Dimensions (HxWxD): 8 x 3.2 x 2cm Compliant with Directive 2014/53/EU (RED).