Description: Use the existing door without breaking the door structure without the need of drilling, no wiring and installation can be used. The product is equipped with intelligent operating system and user-friendly design. It is easy for old and children to use, to protect your family security. Features: Easy to set. The doorbell is low-power and more environment friendly, don't need wire and plug, you just need 2pcs 3.7V 18650 3000mah Li-ion rechargeable battery, which can make your doorbell last for a half of year. System security. P2P wireless technology.password authority management, have a call automatically, and also support PIR detection and 2-way audio. Remote control. Support mobile phone and pads long-distance answer doorbell and unlocking. So you can view images and videos an anywhere and anytime. PIR motion detection. If someone passes by your house, the doorbell will give your an alarm message to your phone and record video at the same time. So you can watch him through the doorbell. Night vision. The doorbell has 6 IR LEDs, day and night can auto-cut. Night visibility up to 15 meters. 720P HD sensor can make you watch more clearly. Specifications: Condition: 100% Brand New Material: ABS Power Supply: 2 * 18650 battery (not included ) Resolution: 1280 * 720 View Angle: 166° Infrared Lamp: 6pcs 850mm WiFi: Support 802.11 b/g/n Audio: Two-way voice with echo cancel function Video Record: TF card(15 seconds each time) Storage: 8G/16G/32G Inform: Push information in 2 second Wake-up Time: Within 600ms Wake-up Method: Push-button/PIR motion detection/Active wake-up by mobile phone Standby Power: 200uA Working Current: 170mA Size: approx. 135 * 66 * 32mm / 5.31 * 2.60 * 1.26inch Package Weight: approx. 337g Note: When the WIFI connection fails, a reset operation is required. There is a reset button on the back of the machine. Long press the reset button and wait until the blue light always flashes to connect. Package Included: 1 * Doorbell Kit .