High-definition picture: The clear picture and large viewing angle can clearly see all the details of the door. Equipped with doorbell indoor unit: Equipped with an indoor unit, when the doorbell is pressed by the doorbell, the indoor unit will sound a reminder. Intelligent reminder & two-way voice intercom: When a guest at the door presses the doorbell, the doorbell will send a reminder to the mobile phone and take 5 snapshots. You can chat with guests at the door through the mobile app. Quick Installation: The smart doorbell is small in size and easy to install. It can be successfully installed in 5 minutes using the app. WIRELESS CONNECTION & APP REMOTE CONTROL: No wires, use battery to charge. It can be used for about 6 months on a single charge of 1.5 hours. The smart doorbell can be controlled remotely using a mobile phone app.