SPECIFICATIONSversion:5.0Speaker size:6mm moving coil unitFrequency response:20Hz~20kHzSensitivity:105dBlmpedance:16ohmMIC sensitivity:-38dBHeadphone type:lithium ion polymer battery(40mah/3.7V)Headphone charging time:within 2 hoursCharging compartment type:lithium ion polymer battery(250mah/3.7V)Charging time of charging compartment:within 2 hoursmusic playing time:4hStandby time:100hProducts include1 * One pair of Bluetooth headsets1 * Charging box1 * Charging cable1 * User Manual2 * Ear cap