Long Standby: No disassembly cycle charging. Built-in lithium-ion high-capacity battery, long standby. The doorbell is powered by built-in large battery, no need to charge frequently; and the chime is of USB power supply, easy and convenient for use Video Call: Easy to deal with visiting guests, when someone presses the doorbell, the doorbell push notification to the phone, and the owner can enter the phone video conversation interface Portable Installation: Can be pasted and perforated. Support adhesive backing, no need to punch holes, while supporting hole punch installation. No plugging, convenient and hassle-free Capture Screen: Storage to the cloud, security protection drip. When a visitor presses the doorbell, it can capture the visitor's picture and save the record to the cloud, so that the cell phone APP can view the past pictures at any time, which is and more secure Night Vision: Built-in high-quality IR LED lamp beads and light sensor, the picture is clear at night; also can automatically switch to night mode from day mode after the ambient light drops down to 2 Lux. Strong and stable signal, easy to pair up, transmission range up to 50 meters, ring tones and volume can be adjusted according your preference Name: Smart Doorbell Max. Resolution: VGA, 640 x 480 Video Coding Standard: MJEPG Audio Coding Standard: G711.A Video Frame Rate: VGA@20fps Day/ Night Mode Switch: Automatic Video Transmission Encryption: Radio Frequency Coding: EV1527 Infrared Lamp Control: Automatic, Adjustable Sensitivity Infrared Lamp Wave Length: 850Nm Motion Detection: Automatic, Adjustable Aensitivity Connection Mode: 2.4G WiFi Working Temperature: -10~45 Working Humidity: 95% (The product printed words depending on the batch, but this does not affect use) Color: As Shown Material: ABS Package Contents: 1 * Smart Doorbell kits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.