vision, allows to see clearly who is at the door, no matter day or night; built-in mic, speaker enables you to hear and speak with. PIR , activity alerts — PIR motion detection can detect movement and send notification to your smartphone, very convenient; detection sensitivity has 3 level, easily adjustable on app (high, medium, low). Group Sharing — it supports user,s accessing camera doorbell with mobile app anytime and anywhere, also sharing with family (up to 4 members) to control the devices together via their mobile phones. Storage and power methods — power supply of camera doorbell is 2 batteries (not included) or others via USB port; all recorded videos can be saved in memory card (not included), secure, reliable. Specifications: Material: Plastic and Electronic Components Color: White Resolution: 1920*1080 Angle: 170° WiFi: Support 2.4G Network Audio: 2-Way Video: TF Card (15s) Storage: Support 8G / 16G / 32G Power Supply: USB Power or 3.7V Battery (NOT included) Notification Time: Within 2s Wake-up Time: Within 600ms Wake-up Method: PIR Detection PIR Distance: 8m PIR Angle: 110° Standby Consumption: 200uA Power Current: 170mA Item Size: 95*55*50mm / 3.74*2.16*1.96in Item Weight: 87g / 3.06oz Package Size: 12*12*10cm / 4.72*4.72*3.93in Package Weight: 310g / 10.93oz Note: Smart video doorbell only, others in pictures are not included. Due to manual measurement, there may be deviation. Due to lights or other reasons, it may slightly differ from pictures. Packing List: 1 * Video Doorbell 1 * USB Cable 1 * Bracket 1 * Adhesive Pad 1 * Wrench 3 * Plastic Expansion Bolt 4 * Screw 1 * User Manual