Wireless Installation: This wireless visual doorbell is easy and fast to install, with no wiring required, reducing wiring trouble for you Long Life: Supports built-in 800mAh lithium battery rechargeable power supply. According to 10 times a day use, it can last about 3 months Language Intercommunication: Support voice intercom, when visitors press the doorbell button, they can talk to each other via cell phone voice intercom call APP Remote Control: If you are not at home, when someone presses your doorbell, your smartphone will receive a video call (must be on the APP interface) and notification no matter where you are Low Battery Alert: The phone will receive an alert when the button power is too low, super fast charging (can be fully charged in about 1.5 hours) Capture Cloud Storage: 75° view angle, when the visitor presses the video doorbell, it will be activated, APP will capture the action and save the screenshot to cloud storage Support Indoor Ringtone: when visitors press the doorbell, a clear indoor ringtone can be heard at home History: You can view the history of button pressed 150m Distance: the long distance can be suitable for most families. Note that this distance is the open distance, the more obstacles in the actual use, the distance will be shortened Multi-Speed Volume Adjustment: 19 music selectable, 4 levels of volume (high, medium, low, mute) selectable Offline Function: When the device is offline, APP will remind the device offline after 30 minutes Specifications: Input voltage: DC100-240V 50/60Hz (receiver), DC5V 2A (button) Button size: 85 x 53 x 24mm Receiver size: 42 x 55 x 25mm Application: Smart Life (Tuya) WiFi Type: 2.4GHZ 802.11b/g/n Distance: 150 meters (open distance) Melody: 19 music tracks Volume: 4 levels of volume Sound: 0-100DB Viewing angle: 75 degrees Battery capacity: 800mAh (button) Plug: USB plug Note: The doorbell can only be activated to watch video when someone presses the doorbell. Video calls can only be answered in the APP interface. The distance is 150 meters open distance, the more obstacles in actual use, the distance will be shortened. Also, the button can not be placed on the iron door or iron fence, which will block the signal. Please put it next to the door.