?Feature? ?Real-time response? With a built-in microphone and speaker, the wireless doorbell gives you real-time clear two-way audio. So you can use this wireless intercom doorbell to speak directly to visitors approaching your front door without getting up to answer. 1) Long-distance imported chips; 2) Solar charging, Android plug-in interface charging; 3) Low power consumption, the outdoor unit is charged once every six months, and the indoor unit is charged for 1 week; 4) Audio interface, you can connect audio/headphone; 5) Voice intercom, clear call. ?Anti-theft and extension? The wireless intercom doorbell is expandable, so you can expand almost any indoor or outdoor system. The outdoor wireless intercom transmitter has screws that allow you to attach it to the wall in case someone takes it away. ?Anti-interference multi-function? This wireless doorbell adopts wireless intercom and has 16 channels, which can meet the use of independent channels for 16 devices, without cross-frequency, and the call is stable; avoid being affected by WIFI interruption, and will not interfere with other devices in your home or neighbors' devices. Buy two receivers and use them as walkie-talkies! [Long distance call] The home is about 1-30 floors, the residential area is about 1000~2000 meters, and the wide area is about 3000 meters. ?Built-in rechargeable battery? This intercom doorbell is waterproof even in harsh weather conditions like snow and heavy rain. Features are low power consumption