The product can be used to replace the traditional peephole, or be installed in the door after the hole is made. It is suitable for offices, villas, courtyard and unit family places. Features: 2.4G all-digital frequency hopping and encryption technique, whose unobstructed effective range is 200 meter, with strong anti-interference ability. 3.5 inch colorful LCD and 0.3Mega pixel camerais used in the indoor unit to display the high quality images. The indoor monitor can take pictures automatically and store about 100 photos and automatically take photoes with time. The brightness, sound volume of calling and ringtone of the indoor unit can be adjusted. The indoor unit can display date and time. The standby time of indoor unit is one to two months, and can also work with power plugged in. The outdoor unit is full-touch waterproof. Outdoor controller can unlock under the condition of both powered on and off. The outdoor unit with infrared night vision function, it can monitor and capture images in low illumination environment. There are 12 built-in chord music ringtone, and the ringtone and volume can be selected. Hands-free calling and intercom functions are equipped and the electric lock can be remotely controlled. The indoor and outdoor both use the Rechargeable Lithium Batteries which are convenient to buy. Specifications: Plug: 100-240V UK Outdoor Camera: Working Rate: 2402~2483.5MHz Transmitting Power: 18~23dBM Camera: 1/4" CMOS Working Current: 300mA Standby Current: 20~30mA Battery: Rechargeable Lithium Battery (Included) Battery Capacity: 1350mah Standby Time: 2 month Adapter Input: AC100~240V, 50/60Hz Adapter Output: DC5V/1A Indoor Monitor: Screen: 3.5 inch TFT LCD Sensitivity: 90dBm Working Current: 250mA Standby Current: 20-30mA/3.7V Battery: Rechargeable Lithium Battery (Included) Battery Capacity: 1350mah Standby Time: 120h Adapter Input: AC100~240V, 50/60Hz Adapter Output: DC5V/1A Working Temperature: -20℃- +50℃ Working Humidity: ＜ 85% Indoor Size: 14 * 13.3 * 2.0cm/5.5*5.2*0.8in Outdoor Size: 15* 5.1 * 9.4cm/6.0*2.0*3.7in Pacakge Weight:816g/28.8oz Package List: 1 * Outdoor Camera (Lithium Battery Included) 1 * Indoor Monitor (Lithium Battery Included) 2 * Power Adapters 1 * USB Cable 1 * Power Line 1 * Package of Screws 1 * Extension Line 1 * User Manual 1、2.4G all-digital frequency hopping and encryption technique, whose unobstructed effective range is 200 meter, with strong anti-interference ability. 2、3.5 inch colorful LCD and 0.3Mega pixel camerais used in the indoor unit to display the high quality images. 3、The indoor monitor can take pictures automatically and store about 100 photos and automatically take photoes with time. 4、The standby time of indoor unit is one to two months, and can also work with power plugged in. 5、Hands-free calling and intercom functions are equipped and the electric lock can be remotely controlled.