Specifications:plug-in chime(receiver),push button (transmitter)

Power supply:receiver: AC 110V-AC 220V 50Hz/60Hz (US,UK,EU,AU plug optional)

           Transmitter: Selfpowered,no battery required

Wireless range:500FT in the open air

Frequency:433Mhz

Max recording time: receiver- 40S

Sound volume:58

No. Of melodies:8

Expandable:YES

Power consumption:receiver-<0.3W, transmitter- <10mW

Wapterproof:IP44

Operating environment:-10-55℃,relative humidity:10%-90%