The Uni-Com Premium Vision Door Chime can be used wall-mounted or free-standing. It has an extensive wireless range of up to 150m, this means the chime unit can be carried around the home and 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 screen on the front of the chime unit is a visual chime alert that will illuminate in your chosen colour (red, blue or green), steady or flashing options can also be selected. 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 4 x AA batteries (not supplied). Specification: Sound Output: 88 dBA Frequency: 433.92 MHz Chime Unit Dimensions (HxWxD): 116 x 116 x 35mm Bell Push Unit Dimensions (HxWxD): 82 x 29 x 19mm Compliant with Directive 2014/53/EU (RED).