Bluetooth V2.1+EDR technologyEquipped with a rotatable microphoneAdopts advanced DSP technology to reduce noiseComes with ear cushions for a comfortable fitBuilt-in high capacity lithium batteryBrand & Model: OVLENG V8 Frequency Response: 20Hz-20KHz Bluetooth: V2.1+EDR Operating Range: 10 meters Operating Voltage: 3.7V Operating Current: 2.5mA Compatibilities: Samsung portable devices， iPod， iPhone， cell phones， tablet PCs and other Bluetooth enabled devices