Indoor Unit: It has Surveillance, Talkback, Unlocking, Ring music choice, Indoor intercom, Sound volume control, Brightness and Color Adjustment function 7Inch TFT LCD, nonradioactive, low power consumption, High definition widescreen image Hands-free intercom function Monitoring functions. The remote unlock function Image brightness, chroma, ring music choice, sound volume control can be adjusted Ultra-thin aluminum panel ABS design 16 different polyphonic sound Ring music choice, will not always hear the monotone of doorbell ring Wall-mounted installation Indoor Unit Size: 22.5*12.8*2.3cm Connection mode: (outdoor unit to indoor unit Used to 4 Core cable) Power supply mode: DC15V/1.2A Two indoor unit can one to one talkback Outdoor unit: Antioxidant Acrylic plate and wear-resisting ABS shell 1099 COMS HD photosensitive Chip, 700TVL, 3.6mm Lens, 92 degrees viewing angle Infrared night vision function (5 PCS IR Led + 1 PCS light resistance) Touch Keypad, Blue backlight, IP55 Water proof cover It has Power to unlock, Power lock, Exit Button unlock Function Wall-mounted installation Outdoor unit size: 155*100*55mm Connection mode: 4 Core cable Power supply mode: DC15V/1.2A Power supply: AC100-240V/ DC15V 1.2A/50/60HZ Machine current: less than 800mA Call delay time: 120S±10% Surveillance delay time: 60S±10% Camera sensor: 700TVL Lens: 3.6mm Lens, 92 degrees viewing angle Wiring Requirements: 1. Within 15 meters can choose with five types of Lan cable 2. 16-30 meters please choose four core pure copper cable with 0.3 square 3. 31-50 meters please choose four core pure copper cable with 0.5 square 4. 51-80 meters please choose four core pure copper cable with 0.75 square 5. 80-120 meters please choose 1.0 square four core pure copper cable 6. 120-150 meters please choose 1.5 square four core pure copper cable Note: Does not include built-in rechargeable battery or memory card.