Bluetooth Version: 4.0 • Chip: BK • Profiles: HFP / HSP / A2DP / AVRCP • Operating Distance: 10 m • Frequency Response: 20 Hz – 20 kHz • Sensitivity: 105 dB • Driver: Ø40 mm • Impedance: 16 Ω • Battery Capacity: 300 mAh • Charge Time: ± 3 Hours • ANC Working Time: ± 8 Hours • Noise Reduction: Up to 20 dB • Power Requirement: 5V DC , 1A FEATURES AND BENEFITS: • Active Noise Cancelling • Hands-free Calling • Removable Aux Cable • Airplane Adaptor and Carry Case Included • Extra Soft, Padded Ear Cups”