as recommended in the operating manual (a page in German, but adequate) charged - registered to BT - and works. At various devices tested (Notebooks - Acer / HP / Medion, mobile - E52, PC's with different USB BT adapter) everywhere immediately as FANTEC BK1 respectively. Hands-free unit detected (Operating Systems W7 32 / W7 64 / W XP32 / Vista64 W). The sound / sound is excellent for a BT headphones in this price range - not tested voice quality in phone connection with phone. The compound (Range) inside the home, at the switched mobile phone's, DECT phones, AVM FB with Wi-Fi, 5 PC's in the immediate vicinity (approx. 4 meters radius) "tears" when trying the 4th wall (about 6 meters in a straight line ) to penetrate from - but is produced with renewed "approach" to the BT adapter immediately. At this price I can recommend the SHS-221BT full, since he not only underlines the classy design in black, but is also perfect and convenient to carry through the length-adjustable earpieces.