This Door Phone is suitable for unit families, such as villas, hotels, office buildings and so on.The outdoor camera can be screwed or pasted on the wall or door. The display signal of the indoor monitor is strong and can be used freely in the places where stable signals cover overally. The indoor monitor can be hung on the wall, the cabinet and so on. It can also be placed on the desk, the tea table and the dining table. Wireless unlocking control link is simple, easy to use, easy to complete visual intercom, one key to unlock. Features: 2.4GHz digital frequency hopping and encryption technology, the transmission distance can reach 20-30 meters, open area, strong anti-interference ability. With infrared night vision function, it can monitor and capture images in low illumination environment. The indoor machine uses the high-definition 7 inch color digital display screen,and the display resolution is 800*480. Indoor display screen adopts high-strength toughened glass, high-grade luxury, and wear-resistant and scratch-proof, durable. The product adopts the most popular touch button,high sensitivity and advanced technology,which prolongs the life of the button. Support remote control of electric locks and adopt hands-free calls and talkback. Built in 16 chord ringtones in the indoor monitor, you can choose the ringtone and adjust the volume.And there are date and time display on the indoor monitor. The indoor monitor can take pictures automatically and store about 100 photos, you can also see the photo taking time on the pictures. Has a disassembly-proof alarm function, when the outdoor unit leaves the rainproof cover, the indoor unit and the outdoor unit will emit a rapid alarm. Give you the best safety performance. Allow you to adjust the indoor display brightness and call volume. The same type of lithium battery can be replaced in outdoor and indoor units. The outdoor unit has a rain proof cover and a touch key. Moisture-proof and waterproof, and the design is more perfect. Specifications: Outdoor unit: Night vision: IR night,visible within 5m Vision angle: 92° Wide Angle Resolution: > 420 TV Line Working temperature: -15°C~+55°C Installation: mounted Size(L * W * H): 13.2* 9.0 * 4.2cm/ 5.2 * 3.5 * 1.7in Standby time: 2 months Working temperature: -40°C~+70°C Battery: BL-5J 1320mAh (Included) Indoor unit: Screen: 7" wide angle TFT LCD, 16:9 Display Power input: AC100V-240V 50Hz-60Hz Resolution: 800 * RGB * 480 Power output: DC 5V/1A Standby time: 7 days Size(L * W * H): 22.5 * 13.5 * 18cm/8.9 * 5.3 * 0.7in Working temperature: -40°C~+70°C battery: BL-5J 1320mAh (Included) Package Weight: 1186g / 41.8oz Package List: 1 * Outdoor Camera 1 * 7" Indoor Monitor 1 * Power Adapter for Outdoor Camera 1 * Power Adapter for Indoor Monitor 2 * BL-5J 1320 mAh of Camera (Included) 1 * Screws and Stoppers 1 * User Manual Note: Please test the machine if it is working properly before installation. 1、2.4GHz digital frequency hopping and encryption technology, the transmission distance can reach 20-30 meters, open area, strong anti?interference ability. 2、The indoor machine uses the high-definition 7 inch color digital display screen,and the display resolution is 800*480. 3、The indoor monitor can take pictures automatically and store about 100 photos, you can also see the photo taking time on the pictures. 4、Has a disassembly-proof alarm function, when the outdoor unit leaves the rainproof cover, the indoor unit and the outdoor unit will emit a rapid alarm. Give you the best safety performance. 5、The outdoor unit has a rain proof cover and a touch key. Moisture-proof and waterproof, and the design is more perfect.