1、4.3‑inch IPS LCD screen and a professional high‑definition camera allow you to clearly watch the visitors outside the door, bringing you worry‑free security protection life. 2、Has Dingdong doorbell function, with high‑decibel reminder, to let you know visitors at the first time in the house, more convenient. 3、Supports real‑time two‑way voice intercom. The camera has a built‑in speaker and microphone, with echo cancellation function. When the sound is received, the noise reduction fidelity keeps the sound clear and restores, giving you an immersive sound and visual experience. 4、Maximum support for 128G TF storage card, no need to plug in and out the memory card. It will automatically cover the farthest date for storage, eliminating your worries about storage. 5、170-degree wide-angle lens, can bring you wide visual effect for much security. Minimalist design is extremely easy to operate. 6、With WIFI remote connection control function, you can manage and watch the use of your smart visual door viewer on the mobile APP at any time. 7、Can keep you informed for 24 hours. PIR human body sensing function has a stay alarm function and push messages in real time. 8、Has a shooting and storage function, which can be used to take photos for suspicious persons, and timely backup data for emergency needs. 9、Has convenient and efficient installation process. Equipped with mounting screws of different sizes, to meet most of your indoor and outdoor doorviewer doorbell installation scenarios. Condition: 100% brand new Item Type: WIFI doorbell Material: ABS plastic Color: As pictures shown Processor: HI3518E Operating System: For LiteOS Lens Pixels: 720P Screen Size: 4.3 inches IPS LCD screen APP: Support for Android/IOS Battery Capacity: 3500Ah(built-in) Wide Angle: 170 degrees Infrared Night Vision, Automatic Camera, Surveillance Intercom, Motion Detection Maximum Support 128G memory card(not included) Support Door Thickness: Approx.35-100MM/1.4-3.9in Language: English/Chinese Applicable Door Hole Diameter: Approx.14-35MM/0.6-1.4in Use Environment Temperature: -20-55℃ 1 x Data Line 1 x Indoor Unit 1 x Outdoor Unit 1 x Hanging Board 3 x Screws (1 x Long Screw, 1 x Middle Screw, 1 x Short Screw) 1 x Manual