Features : Music/talk time: about 33H (80% volume) (with charging box capacity) - This indicates the earphones can deliver around 33 hours of playback time on a single charge at 80% volume. However, this playtime likely includes using the charging case to recharge the earphones during use. Earphone battery capacity: 70mAhx2 - This refers to the battery capacity of each earphone, which is 70mAh. Charging box battery capacity: 450mAh - This specifies the capacity of the battery in the charging case, which is 450mAh. The charging case is likely used to store and recharge the earphones when not in use. Charging time: about 1H/2H - This indicates the estimated time it takes to charge the earphones fully. It could take around 1 hour or up to 2 hours depending on the charger used. Specification: - Material: PC+ABS+electroplating UV - Bluetooth version. BT8926B2 V5.3 - Music/talk time: about 33H (80% volume) (with charging box capacity Specification Package Weight: One Package Weight One Package Size Qty 0.38lb 15cm * 9.5cm * 5cm