Check the listing for details. Wireless Intercom Doorbell Chime for Home Intercomunicador Build-in Rechargeable. Condition: New. Listed at 29.99 USD. What makes our products unique?Wuloo is specialized in designing and manufacturing FM wireless products for more than 10 years. All Wuloo products will research other similar products before manufacturing, we can ensure all of our products are better than others.Why do we love what we do?Wuloo focus on designing better FM wireless products. We are committed to making our customers' lives safer and more convenient, which do not need to work with unstable Wifi.Product Feature[Simple Installation & Expansion!] Secure this outdoor doorbell chime to your door or wall with the included screws for ultimate security. The wireless intercom doorbell is expandable, so you can extend nearly any indoor or outdoor system, even to a set of 2 transmitters and receivers each![Long Range & Easy Sound Adjustments] This wireless doorbell transmits at a distance of up to 1/2 Mile! Customize your doorbell with 20 kinds of chimes and 3 volume levels![Wuloo Brand] Wuloo are specialized in FM / ASK / FSK wireless techology for more than 20 years. Package equiped with quick start guide and detailed manual.[Anti-interference & Multifunctional] This doorbell doubles as an FM wireless intercom doorbell that won’t be affected by WiFi disruptions! It also won’t interfere with your other smart devices. Buy two receivers and use as a set of walkie-talkies, or use the mute mode on the indoor intercomunicador to turn off the unit when you want silence.[IPX55 Waterproof and Built-in Rechargeable Battery] The Wuloo intercom doorbell is waterproof even in bad weather conditions like snow and rainstorms. Features low power consumption, built-in 2000mA battery, and an included charging base! Full battery lasts 4-6 months for the transmitter, and indoor machine lasts 1-2 days on a full charge.How to use the wireless intercom doorbell1) Set the same channel (A, B, or C) for both the indoor and outdoor machine;2) Long press the ON/OFF button of the indoor machine to turn it on;3) Attach the outdoor machine to the exterior of your front door. Once the chime rings, click the ON\OFF button or the TALK button of the indoor chime to stop the ringing. To speak to the visitor, press and hold the TALK key to communicate with the outdoor device. Release the TALK button after speaking to listen to any response from outside. The visitor simply press and hold the TALK key to respond.Note:1.The factory setting of the indoor machine is in the shutdown state. After receiving the goods, please long press ON/OFF key button for 3 seconds to turn on the indoor unit.2.Outdoor machine will return to sleeping mode if it does not detect action within 25 seconds. Please click CALL button on the outdoor machine to activate the outdoor machine. Each conversation must be initiated by outdoor machine， and then the indoor machine can talk with the outdoor unit after receiving the ring.3.This wireless intercom doorbell is a unidirectional transmission system with the same frequency. You cannot speak to your visitor and listen to them at the same time. Please wait until the visitor is done speaking to press the TALK key to respond.