Eklasse EKBTANCHP02XM Bluetooth Active Noise Canceling Headphone

SPECIFICATIONS
Bluetooth: Version 4.1, Noise Reduction: Up to 20dB between 100 to 500Hz, Battery: Lithium Battery 250mAh, Driver, Unit: 40mm Neodymium, Sensitivity: 99dB±3dB, Frequency: 20Hz-20KHz, Impedance: 32Ohms, Working Time: 8 Hours at medium volume with BT and ANC On