Long Range Doorbell: This wireless remote control doorbell adopts high-frequency electrical technology and frequency modulation signal protocol to provide strong anti-interference protection and multi-signal pairing. Customize your 4 doorbell chimes, our doorbells can reach up to 1000 feet and operate at temperatures between -4 ° F and 140 ° F. This wireless doorbell also features IP55 waterproof and LED lights!
Doorbell Strong Battery: Wireless doorbell is powered by a rechargeable lithium battery. When the battery is low, the doorbell receiver will sound a voice prompt to tell you which unit needs to be charged. The upgraded receiving battery lasts 12 days on a full charge, and the Door Bell transmitter battery can be used for 4 months on a full charge.