Low Power Consumption, energy saving Easy installation and easy operation Wireless door chime 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. 32 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. Doorbell chimes provides an extra security and convenience for you and your family, you can put this Doorbell to any places of your room. This Wireless Doorbell is excellent for being used at home, office, shop or any places need to welcome the guests or the customers. The ultra-long distance can reach 50 meters away. it can overcome any obstacles during the course of transmission and receiving, Brand No Brand SKU 101112953_NP-1021710237