You can connect more 3x 7'' slave monitors and 2 doorbells. All can see, hear, speak to the outdoor camera and unlock the door.Power supply: There is an external power supply (12V2A) in the box for the indoor display mounted on the base. If you dont want to use an external power supply, you can extend the cord to your DIN rail power supply or home power center.You can set the detection area of the doorbell camera. When motion detection is triggered, the device will start recording or taking pictures even if no presses the doorbell.Optional ringtones: 12 kinds of ringtones are built in the indoor monitor. You can set different volume levels for different times of the day, and you can adjust the ringing time as needed.Automatic recording: When a visitor presses the doorbell or triggers motion detection, the doorbell camera will automatically record a video or snap a picture and save it in an additional card to protect your home. (SD card needs to be purchased separately)1080P resolutionFull 1080P high-definition picture quality, more details, more real7-inch TFT LCD, slim design, stylish touch buttonsRainproof night visionIP65 waterproof design, stable work in rainy, cloudy, cold and snowy days.Built-in 1200TVL pinhole camera, aluminum alloy panel, rainproof, dustproof and vandal-proof.Infrared LED lighting can provide better night vision.120 wide viewing angle: outdoor doorbell with waterproof cover, built-in infrared sensor and 1080P camera, 120 wide viewing angle'Package includes: 1*doorbell