*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. Match With: ZT-707 2.4G Wireless AV Color Receiver