This is Panasonic Eneloop Battery And Charger With AA AAA Battery Pack. White chager can charge black and white AA AAA eneloop battery all. Instructions for use: Corresponding voltage AC100-240V 2 LED lights display 2 or 4×5 batteries 2 or 4×7 batteries Please be sure to charge 2 or 4 batteries at the same time cc51 is a standard charger, It takes about 10 hours if it is full, Fully turn off the lights in 13 hours. If the power is cut off midway, The charger will re-clock for 13 hours. So this charger can usually be unplugged after 10 hours of charging.