KSC-1109 White Bluetooth Earphones Characteristics Material: ABS+Polycarbonate Chip: Jerry 6983D2 Bluetooth Version: BT V5.3 Transmission distance: ?10m Usage time: about 5 hours Headphone battery: 30mAhCharging compartment: 300mAh Charging time: about 1 hour Speaker: diameter ?13mm Sensitivity: 107 dB SPL +/- 3 dB Response speed: 50ms delay Frequency range: 20Hz-20KHz Charging values: 5V/1A Product Dimensions: 60.5 x 21.6 x 45.2mm Product weight: 60.5g