transmission range: 100m (in open area) power source of button: 1×23a 12v battery (included) music:a) double clink & alice & westminster b)customize different types of music transmitting frequency: 433mhz/315mhz/418mhz approval:ce,r&tte,rohs receiver(bell) size：93×63×26(mm) button(transmitter) size：86×43×18(mm) power source of receiver: 2 × aa battery/ac230v/ac110v