Active Noise Canceling Headest   Headphone with built-in Media Player   Flash Pen         Docking Station   Docking Station Media Player     SD Media Player   3.5"HDD Media Player     2.5"HDD Media Player Specifications: • Foldable neck band Active Noise Canceling Headset Speaker: • 30mm NDFeB magnet Speaker (32Ω) • Frequency response of speaker : 70Hz~20KHz • Sound pressure level (SPL): 92dB+/-3dB Microphone: • Sensitivity of microphone: -40dB +/- 2dB • Frequency response of microphone: 70Hz~20KHz • Directivity of microphone: Omnidirectional ANC circuit: • Frequency response of ANC circuit: 70Hz~20KHz • Noise reduction: • Maximum noise reduction level: 15dB • Noise reduction active range: 70Hz~700Hz Others: • Range of operating voltage: 1.0 ~ 1.5VDC • Jack plug: 3.5mm Stereo control • Cord 6Ft. STR.Cord • Feature: Power ON/OFF • Operating temperature : 0-55 • Power source: 3A battery x1 (Alkaline battery 1000mAH) • Battery life span: An average of 40 hours • Power consumption<25mA