Kingavon digital door chime required no wiring, this easy to install door chime simply plugs into any wall socket and has up to an 80m range with 36 available melodies to choose from. The volume is adjustable with ring, flash or flash and ring function options. The push button transmitter requires 1 x CR2032 3V button cell battery which is included. CE Approved. Kingavon supplying quality Lighting, household electrical and security products.