The K 105 UHF operates in the 864 MHz frequency band allocated exclusively to audio equipment and thus ensures extremely reliable, interference-free reception. RF transmission technology allows you to receive the signal over distances of up to 330 ft. (100 m), through walls and ceilings. You can therefore use the K 105 UHF in your apartment, house, or garden with no loss in sound quality.
The supplied NiCd rechargeable batteries provide up to 10 hours of undisturbed listening enjoyment. An integrated charging feature provides a convenient way of charging the batteries inside the headphones. Of course, the K 105 UHF provides the same wearing comfort that AKG headphones are famous for. Circumaural, detachable ear pads and the AKG self-adjusting headband make the headphones fit every head perfectly. Large speakers deliver an extremely powerful sound with punchy bass and a clear high end.
For the price these aren't bad earphones. I tried a few of the cheaper ones - I wasn't too fussed as this was for listening to music at work. The best thing about these headphones are the ergonomics - all of the cheaper ones squashed my ears and after 2-3hours started to hurt. The earpieces are nice and big and block out ambient sound quite well. Two problems: reception (constant background hiss) and the Auto-volume adjuster - occasionally doesn't pick things up as I play music quite quietly, and will sometimes blast me! :)