Wireless Voice Intercom DoorbellWorking principlePress Ring Button on outdoor-bell, indoor-bell will ring, now hold Answer Button on the indoor-bell to speakFeaature:1.Outdoor-bell is power supplied by 4pcs alkaline battery, easy to replace the battery, indoor-bell is power supplied by rechargeable Li-ion battery.2.Low power consumption, long standby time for outdoor-bell up to six months3.Big and adjustable speaker, clear voice, can be used as mobile interphone.4.Long wireless distance up to 300M5.Easily installed with 3M tape on the wall6.Outdoor-bell pair with indoor-bell by learning its code, 1 outdoor-bell can paired with N indoor-bells and no interference each other.7.Small andbeautiful, size: 100*60*14.8mmNotice: This Doorbell Only Voice intercom, no video function, please take care.Outdoor Install:1.Remove the battery cover2.Insert 4pcs alkaline battery3.Press the Ring Button, LED around the Ring Button light on, it means the device is installed ok4.Screw up the deviceIndoor bell Install:1.Slide powerswitch to ON2.Press the Answer Button, device sound du du ,it means device is installed okPair methodTurn indoor-bell on and hold Answer Button for about 5 seconds, then release this button, LED flash quickly, now, click the Ring Button on the outdoor-bell,When LED on theindoor-bell go out, it means they pair successfully.