The Uni-Com Premium Portable Door Chime can be wall-mounted or free-standing around your home and garden. The extensive wireless range of up to 150m 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 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 and other pleasant sounding melodies. The volume can be adjusted to your preference. There is also a built-in mute switch which is ideal for when children or shift workers are sleeping. 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: 88 dBA Frequency: 433.92 MHz Chime Unit Dimensions (HxWxD): 125 x 80 x 27mm Bell Push Unit Dimensions (HxWxD): 80 x 30 x 20mm Compliant with Directive 2014/53/EU (RED).