KSC-1108 White Bluetooth Earphones Characteristics Model: KSC-1108 Material: ABS + Polycarbonate Chip: Jerry 6983D2 BT Version: BT V5.3 Transmission distance: ≥ 10m Usage time: about 5 hours Earphone battery: 30mAh Charging case: 300mAh  Charging time: about 1 hour Driver: diameter Ф 13 mm Sensitivity: 107 dB SPL+/-3 dB Response speed: 50ms delay Frequency range: 20Hz-20KHz Charging values: 5V/1A Product size: 54.4*21.3*46.4mm Product weight: 43g