The black JBL Charging Case for In-Ear Wireless Headphones is small and lightweight (at 2.82 oz) enough to be stored in your pocket, backpack, or sport bag. It allows you to recharge most wireless in-ear headphones on the go, and enjoy up to 16 hours of additional playtime. If you're in a hurry, you can do a quick 15-minute recharge to get an hour of headphone playtime, and simultaneously charge the headphones and the case battery.