KSC-1107 White Bluetooth Earphones Characteristics 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: 1 hour Driver: diameter Ф 13 mm Sensitivity: 107 dB SPL+/-3 dB Response speed: 50ms delay Frequency range: 20Hz-20KHz Charging method: lighting Input: 5V/1A Product size: 44.2*53.6*21.4mm Product weight: 46.5g