The Uni-Com Premium Portable Flashing Door Chime can be wall-mounted or free-standing around your home. 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. There are 3 operating modes: chime sound only, flashing light only and both chime and flashing. The volume can also be adjusted to your preference. There is also a built-in mute switch (which along with the flashing only mode), is ideal for use 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 C batteries (not supplied). Specification: Sound Output: 88 dBA Frequency: 433.92 MHz Chime Unit Dimensions (HxWxD): 145 x 92 x 42mm Bell Push Unit Dimensions (HxWxD): 80 x 30 x 20mm Compliant with Directive 2014/53/EU (RED).