Choices of 16 melodies with strobe light.   up to 100 meters range  Sounds Dingdong , Ring, music and music  Frequency: 433.92MHZ or 315MHZ  The bellpush transmitter is powered by a 12 volts battery type 23A   The receiver plug in the mains (230V or 110V)  Digital coded and radio signal to prevent false triggering

Plug-in Wireless Doorbell