Smart WIFI Video Doorbell System: Lite OS Lens: Full 6G Wide Angle 1.7mm Lens Perspective: Horizontal 166 Standby Time: About 6-10 months (10 wake-ups per day, 30 seconds each time) CMOS Performance: Supports automatic white balance, automatic gain control, automatic backlight compensation Day and night Conversion: Dual filters automatically switch Infrared Distance: 850nm infrared, effective distance 5m Network Configuration: One-click WIFI Configuration + Sonic Configuration PIR Human Detection: Supports PIR Detection and Wakeup Audio Coding Standards: AAC and G.726 Audio In/Out: -38dB Microphone / Built-in 1 Speaker Video Management: video reccording, manual reccording, alarm reccording WiFi: 2.4GHz Network Protocols: TCP/IP, HTTP, TCP, UDP, SMTP, DHCP, DNS, P2P Wireless: WIFI802.11b/g/n wireless network Passive human infrared detection: Support Adaptive Code Rate: Support Two-way Talkback: Support full-duplex real-time call Panoramic Display Mode: Simulate 3D and auto c ruIise Voice Phone Call: Support Remote Wake-up: Support PIR Wakeup: Support Operating Humidity: ?80%RH Function: Voice call; Video intercom; MobIile remote wake; 166 viewing angle; 1280*720 high-definition resolution; Infrared night vision; Long standby; Built-in WiFi module; Motion d etecting + Speed information push Color: Black, Silver Size: 144 x 74 x 32mm Power Supply: 3 x 18650 Rechargeable Battery ?Without Batteries?