Twin pack includes both a portable and plug-in wireless door chime, with long open range of 200m. Features 8 high quality melodies, volume control with extra loud setting of 90db for the hard of hearing, mute function, and IP44 rated bell push button with LED confirmation light. The portable doorbell is battery-powered and can be placed where required, and plug-in door chime can be used in any UK socket in the home. Chime provides multi-colour visual alert to indicate activity at the door, even if muted. Battery-Powered Bell Push & Chime 8 Melodies 200m Range Up to 8 Chimes Supported Adjustable Volume with Mute Function IP44 Rated Bell Push Extra Loud Chime Battery-Powered Bell Push & Chime 8 Melodies 200m Range Up to 8 Chimes Supported Adjustable Volume with Mute Function IP44 Rated Bell Push Extra Loud Chime