Volume Adjustable Dingdong Machine: WiFi Bluetooth two kinds of connection, receiver placement is not limited; multi grade adjustable volume, noisy environment can also hear, quiet environment does not disturb the family rest. APP Real Time Monitoring and Remote Control: After the visitor presses the electronic doorbell, the doorbell will push the notification to the cell phone, the owner can enter the cell phone call interface, remote control, real time view of the door situation. High Definition Wide Angle Lens: A new generation of wide angle lens, the situation in front of the door at all times, so that the door does not leave a safe corner, multiple visitors can also be seen one by one. Two Way Voice Design: Two way voice design, with high powered speakers and high sensitivity microphone, clear and smooth door visual calls. Cloud Storage Comprehensive Encryption, Automatic Cycle Override: Visitor records saved in the cloud, data encryption more secure, anytime, anywhere through the cell phone APP to view the visitor records, home situation as clear as day.