NOISEHUSH NS400 PINK STEREO SPORT BLUETOOTH HEADSET Special Features: • Comfortable Behind-the-Neck Design • Built-in Rechargeable Li-Polymer Battery • Foldable for Maximum Portability • Easy Touch volume and Track Control Functions • Carrying Case Included Specifications: • Bluetooth: V2.1 EDR • Transmission Power: Class 2 • Bluetooth Profiles: A2DP, AVRCP, HS/HF • Frequency Response: 20Hz-20KHz • Frequency Range: 2.4GHz~2.480GHz • Transmission Distance: 10 meters • Battery: 400mAh Li-Poly