Volkano Motion Bluetooth Earphones - Black And Grey (VK1005BBKGR) - Frequency Response: 20 Hz ~ 20 kHz, Impedance: 32 Ω, Sensitivity: 105 ± 5 dB, Playtime: 3 ~ 4 Hours, Bluetooth Version: 5.0, Charge Time: 3 Hours, Battery Capacity: 70 mAh