Chip: JL6973 Bluetooth version: 5.3 Earphone battery capacity: 35mAh with protective board Charging compartment capacity: 300mAh with protective board Speaker: 10mm/32 Ω/composite film Charging time: 1.5H Music playback time: 4h (70% volume) Talk time: 3 hours Earphones+compartment working time: 17h Transmission range: 10M Material: PC+ABS environmentally friendly material, stylish and simple appearance, in ear wearing method. The elliptical shape fits the contour of the ear more closely, combining comfort and airtightness 10mm genuine copper ring with pure and pleasant sound