The case carries enough power to charge the earbuds up to 4 times.*
To Charge them:
1. Place them in the charge case.
2. A red light on the earbuds will indicate charging. When the red light disappears, they are fully charged.
3. Recharge the case, if needed.
*Based on 50% volume and 5 charges from the case to the earbuds of 3 hours of playtime