With this Charging Case you give 18 hours of extra battery time to the Bose SoundSport Wireless. This is useful if you often take the caps with you, but are not often close to an outlet. Think of a long bus or flight. A short charge of 15 minutes gives you an hour of extra listening time. The caps are fully charged in just 2 hours. The design has built-in LED lamps. This light indicates when the case and the caps are fully charged. Do not you use the caps? Then you take them anywhere in the case.