Rosewill Lumin-Charge 5-Feet Charge/Sync USB to Micro-USB Pure Copper Cable with LED Charge Indicator (R4U-13001-BK) Pure Copper Core allows up to 20% faster charging and accurate data transfer Magnetic Shielding allows fast and accurate data transfer Patented LED indicator in Micro USB connector Red light is charging Blue light is 100% charged No need to wake up device's screen to know charging status