The doorbell kit has two indoor units, one outdoor unit, one remote control and one NO lock, the outdoor unit has a password and fingerprint unlock function, and the indoor unit also has an unlock function.Features:Indoor Unit7-inch TFT LCD screen, no radiation, low power, high definition widescreen imageHands-free intercom functionElectronically controlled unlocking functionMonitoring outdoor functionUltra-thin aluminum panel design, blue light button, beautiful and luxuriousVolume, brightness and contrast are adjustable16 kinds of chord sounds are optional, and you won't always hear monotonous doorbellsOutdoor UnitOutdoor unit shell made of anti-oxidation aluminum panel with wear-resistant surface treatmentSuper rainproof, IP55 waterproof.Blue light buttonInfrared night vision function, wall mounted installation is simple and convenientPower-on unlock and power-off unlockCan be connected to exit switch and set to delay unlockingPassword/fingerprint/remote control unlock functionSpecification:Condition: 100% NewMaterial: Metal + PMMA + ABS Color: As picture shownVoltage:110V-240VPlug: US, UK, EU, AU (Optional)Indoor Unit Size: approx. 235*165*30mm/9.2*6.5*1.2inOutdoor Unit Size: approx. 155*100*55mm/6.1*3.9*2.1inDoorbell Switch power supply: AC110V-240V 50Hz DC15V 1.2ACurrent: less than 800mACall delay time: 120S 10%Monitoring delay time: 60S 10%Camera sensor: 700 linesLens: 3.6MM 92Outdoor unit with infrared night visionNO LockVoltage: DC12VCurrent: 200mAKeep: 500kg/1102lbFault protection, no mode (locked when power is off)Use a 2-wire nonpolar connection to access control or export equipmentSignal output: noPackage List:2 * Indoor Unit1 * Outdoor Unit1 * User Manual2 * 5 Meter Connecting Line3 * Power Adapter1 * Remote Control (Built in 1 * button battery)1 * NO Lock (With 1 * User Manual, 1 * Pack of Screw).