Model: W27 Bluetooth Chip: JL6973D4 Bluetooth Version:V5.1 Transmission Distance:10m Drive Unit:13mm Sensitivity:118db±3 Working Frequency:2.402GHz-2.480GHz Battery Capacity:30mAh Charging Box Capacity:220mAh Charging Box Capacity Time:About 1-2H Music Time:About 4.5H Standby Time:About 60days Input voltage:DC 5V