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% |