Wireless Headphones - with microphone, behind-the-ear, closed construction, Bluetooth, track shuffle, taking calls, with volume control, frequency range: 50 Hz-18000 Hz, sensitivity: 101 dB/mW Enjoy listening to music without annoying cables. Their ear-covering design guarantees amazing insulation against surrounding noise. These Koss BT/221i grey Wireless Headphones have Bluetooth technology for wireless connection to your device. Say goodbye to bothersome cables. With a frequency ranging 50 to 18000 Hz, you will rest assured knowing that you will not miss a note of your favourite song.   These wireless headphones even include an integrated microphone. The volume can be changed with the control wheel. This model can even pick up calls. Songs can be switched easily and quickly using the controls. Koss BT/221i grey Wireless Headphones Key Features Material of these wireless headphones from Koss BT/221i grey: closed Stylish grey colour Volume control buttons...