wireless doorchime

•Working frequency of 434 MHz .Prevent wrong calling by anti-interference digital technology and 19,683 pairs of codes; Or even over one million pairs of codes under the new technology with Super heterodyne circuit. Remote control distance above 60m.IP44 waterproof transmitter .Sixteen melody rings for option Enclosed two-year lifespan batteries, and made by energy-saving patent technology .Professional remote control technology for more choices in installing the transmitter, even on iron gates .Receiver with input DC voltage, relevant control distance of 60 m or 120m (CE and FCC approved)