Compatible with tablets, smartphones, PCs, and other devices with Bluetooth® Full battery earbud charge is 4 hours, magnetic charging case capacity is 12 hours (charge earbuds 2-3x). Sleep mode is earbuds at a full charge. goes into sleep mode due to no use and not used until battery is depleted. Hibernation mode is when earbuds are in the charging case at a full charge, goes into hibernation mode in case, not used, gradually battery depletes. Actual battery life will vary with use and environmental conditions and will naturally decrease with time and usage.