Features: (This package has two indoor units and one outdoor unit) Outdoor Call Intercom: Press the didong button of the outdoor unit to talk to people indoors. Indoor Call Intercom: Press the monitor button to see the outside phone, and then press the intercom button to talk to people outside. Monitoring: Press the indoor unit monitoring button to see the situation of the outdoor unit Unlock: The indoor unit has the function of unlocking (note that the doorbell does not have a lock) Hands-free: hands-free intercom Can take photos or videos: When someone presses the outdoor unit, the doorbell will automatically take photos or videos, you can choose by yourself. Features: Indoor Monitor : 7-inch TFT LCD, no radiation, low power, high definition widescreen image. It has a hands-free intercom function and an electronically controlled unlock function. You can monitor the outdoors and adjust the image brightness, chrominance and volume. It can take photos, videos, and supports up to 32GTF cards. 16 music can be selected, so your doorbell is not monotonous. Outdoor Camera: It is waterproof with night vision infrared function. The surface of the metal material is wear-resistant. It can be electrically unlocked.Wall-mounted installation is simple and convenient. Specifications: Condition: Brand New Color: Show as Picture Material: Aluminum + ABS Plug Type: US Plug Switching Power Supply: AC 110 V-240 V 50Hz/60Hz, DC15V 1.2A Machine Current: Less Than 800mA Call Delay Time: 120S 10% Monitoring Delay Time: 60 S 10% Camera Sensor: 700 Line Lens: 3.6MM92 Degrees Indoor Unit Size: Approx. 203 * 106 * 19mm/8.0 * 4.2 * 0.7 in Outdoor Unit Size: Approx. 138 * 98 * 44mm/5.4 * 3.9 * 1.7 in Package List: 2 * Indoor Monitor 1 * Outdoor Camera 2 * Four-core 5 Meter Line 2 * Power Supply 1 * Instruction Manual Note: 1.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 2.It is recommended to use all-copper CAT-5 cable for wiring within 30 meters / 98.4ft ; use a 0.5 square 4-core all-copper cable for wiring of 50-80 meters / 164-262ft ; the package provides a 5m / 16.4 4-core cable. When you receive the doorbell, please use a 5m / 16.4 4-core wire to test whether the doorbell is working properly. Package List 17-inch TFT LCD, no radiation, low power, high definition widescreen image. 2It has a hands-free intercom function and an electronically controlled unlock function. 3You can monitor the outdoors and adjust the image brightness, chrominance and volume. 4It can take photos, videos, and supports up to 32GTF cards. 516 music can be selected, so your doorbell is not monotonous.