Function: AUX / Button Control Chip: AC6956A Bluetooth Version: V5.1 Headphone Battery: 350mAh Play Time: 20 hours Talk Time: 19 hours Charging Time: 2.5 hours USB Port: Type-C Headphone Dimension: 170*195*76mm Headphone Net Weight: 185g Wireless Working Range: 10M Speaker Size: 40mm