1、Low Power Consumption: 1800mAh lithium ion battery, easy to use. Support USB or mobile power supply. 2、Infrared Night Vision: Two 850nm infrared lights, infrared distance 1‑2m/28‑6.56ft, using PMW splitting technology, the night is clearer. 3、Video Camera Mode: Support video mode or camera mode, automatic shutdown function, support manual image capture. 4、Weatherproof: IP55 waterproof rating, it can be used even in rainy weather outdoors. 5、Data Storage Mode: No stored data will be lost after power failure, maximum support 32G high‑speed memory storage card. 1 x Inner Door Machine1 x Outer Door Viewer1 x Fixed Plate6 x Screw1 x USB Cable1 x Manual Item Type: Door ViewerMaterial: ABS+Zinc AlloyUse: HouseholdBattery: 3.7V lithium battery 1800mah (built-in battery)USB Power Supply: DC 5VImage Sensor: 1/4in CMOSCamera Pixel: 1MPEffective Pixels: 1280 (H) x 720 (V)Minimum Illumination: 0.5Lux / F 2.0 (colorful), 0.02Lux / F 2.0 (black and white)White Balance: Automatic tracking white balanceGain Control: AutomaticSignal To Noise Ratio: > 50dBBacklight Compensation: OnWide Dynamic: YesElectronic Shutter: 1 / 4-1 / 10,000sDay/night Mode: Filter the color to blackFocal Length: 2.4mmHorizontal Viewing Angle: 140°Number Of Aperture: F 2.0Infrared Night Vision Light: 2pcs approx. 3mm/ 0.12in flat head 90° 850 infrared lightAutomatic Power Off: Off, 10s, 20s, 30sLanguage: Chinese, EnglishDisplay Setting: On/offRecording Time: 10s, 20s, 30sPower-off Memory: SupportDefault Setting: SupportRingtone Setting: Built-in 4 ringtonesVolume Setting: 3 levels of volume optionalLCD Screen Size: 4.3inLCD Screen Resolution: 480 x 272Memory Card: Maximum support 32GMaximum Image Size: 1280 x 720Frame Rate: 50HZ, 25 frames (1280 x 720P)Video Compression: M-JPEGAudio Compression: G.711 / 16kbpsWaterproof Rating: IP55Support Door Thickness: Approx. 40-110mm/ 1.58- 4.33inSupport Door Hole Size: Approx. 15-50mm/ 0.59- 1.97in