Discovery Smart Led Micro USB Sync and Charger Cable For Samsung Galaxy S4 S3/ HTC/ Google Smartphones Tablets Android Device (Smart LED-Black)

The two built-in LED'S allow the color to change based on the battery status. When the cable is plugged into the wall or computer, it will light up blue, signaling that it is activated and ready to be used. Once plugged into the device, the LED will turn red, and charge your device to full capacity. Finally, once the charge is at full, it will return to the non-flashing blue color.