This is an USB cable tester, which can help us to test if the USB cable you want is original or copy. It has a indicator to tell us the result, the red light indicates the cable is copy type, and the color is the original mark. Such as the OEM 8Pin USB2.0 Lightning Charge Data Sync Cable for iPhone 5s 5 5c has been tested.
http://www.hytparts.com/004985-oem-8pin-usb2-0-lightning-charge-data-sync-cable-for-iphone-5s-5-5c.html