A fully charged case can charge the earbuds 5-6 times, providing up to an additional 24 hours of play time.
How to charge the earbuds:
Put them back into the case, they will begin charging. Usually will take a hour or so to fully charge the earbuds (LED lights both will be red first, then turn white briefly then turn off, this means they are fully charged)
How to charge the case:
Use the Micro USB cable to connect the case to a 5V / 0.5-2A USB wall charger /car charger / computer USB port, If the LED light next to the Micro USB side is flashing white, It means battery is less than 25%. You need to charge your case. All four LED lights on the case will be solid white when fully charged (takes about 2.5 hours).