Night vision:Built-in IR lights, 5 meters Nightvision range Built-in rechargeable Li-battery in camera, work individually and continuously for 5 hours above Tiny in Size for discreet observation & portability High-quality picture and sound transmitting and receiving 4-channel available to avoid interference Min 100m transmission distance without block Can be used on TV, monitor, LCD, etc. Suitable for monitoring children, elders, and widely used for theft prevention, after-hours surveillance, home security, etc.