[2-Way Audio] When someone press the doorbell, a push notification can be sent to your smartphone immediately; with built-in mic, you can see and talk to your visitors at anytime and anywhere.  [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. [Equipped with Doorbell Chime] Strong and stable signal, easy to pair up, transmission range up to 50 meters; ring tones and volume can be adjusted according your preference.  [Power Supply] The doorbell is powered by built-in 1000mAh large battery, no need to charge frequently; and the chime is of USB power supply, easy and convenient for use. Specifications: Color: Black & white Material: ABS Max. Resolution: VGA, 640*480 Video Coding Standard: MJEPG Audio Coding Standard: G711.A Video Frame Rate: VGA@20fps Day/ Night Mode Switch: Automatic Video Preview: P2P Video Transmission Encryption: AES Radio Frequency Coding: EV1527 Infrared Lamp Control: Automatic, adjustable sensitivity Infrared Lamp Wave Length: 850nm Motion Detection: Automatic, adjustable sensitivity Connection Mode: 2.4G WiFi Working Temperature: -10～45℃  Working Humidity: ≤95% Doorbell Battery Capacity: 1000mAh Doorbell Charging Port: Android port Chime Power Supply: USB   Doorbell Size: 7.3 * 4.6 * 2.5cm/ 2.8 * 1.8 * 0.9inch Chime Size: 4.3 * 4.1 * 3.2cm/ 1.6 * 1.6 * 1.2inch Doorbell Weight: 55g/ 1.9oz Note: 5G network is not compatible. Package List: 1 * Doorbell 1 * Chime 3 * Screw 2 * Screw Extension Tube 1 * Cable 1 * User Manual