The Arlec Chime Door Everyday Wireless Plug In is a great wireless door chime for single family homes, apartment buildings, townhouses, and condos. It includes battery operated design with 32 selectable melodies and 3 level volume adjustment. The transmitter can work up to 70 meters away while the receiver has a range of up to 30 meters. Also included is the interchangeable code transmitter that allows you to set your own melody combinations and will avoid signal interference. It also comes with a long-range and modern design for years of use. - Battery operated door chime with 32 selectable melodies and 3 level volume adjustment - Learning code technology with encrypted transmitter and receiver - For 256 different code variations to avoid signal interference - Modern design with long-range (70+m)3 years + transmitter battery life - Blister + card packaging