Yison Celebrat A9 Bluetooth HeadphoneYison Celebrat A9 Bluetooth Headphone comes with 300mAh capacity battery. This Bluetooth headphone featured Impedance: 32, Sensitivity: 105DB±3DB, Transmission: 10M, and Charging voltage: DC5V. You can enjoy Playing Time: 8-10Hr, Standby time: 2 months and Charge..