Focus range: 3 cm - infinity 

Output Interface: USB2.0 

Frequently Asked Questions [analysis] 

One. There flooding camera driver must be installed， and then plug the camera. Camera-free drive， plug in the computer， the system will automatically install， installation prompts you to install new hardware has been available， open My Computer， see USB video device， double-click to open the USB video device， test the camera! If the screen is blank， you can replace the USB port. 

Two. If the camera is very vague， you can rotate the camera in the middle of the lens to adjust the focus.