The Uni-Com Premium Ringing Door Bell is specifically designed to be wall-mounted. The extensive wireless range of up to 150m means the bell can be fitted in any room or outside in the garage and shed 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 has an extra loud traditional ringing bell sound. 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: 95 dBA Frequency: 433.92 MHz Chime Unit Dimensions (WxD): 110 x 77mm Bell Push Unit Dimensions (HxWxD): 77 x 28 x 18mm Compliant with Directive 2014/53/EU (RED).