Supersedes the D10 Series The IMPACT D Series from EPOS|Sennheiser is their wireless DECT Headset with a base unit for a single device such as desk phone or PC. The D10II models replace the hugely popular D10s with a very slightly different look but the same specifications. D30s have been added to extend the range to include a duo wearing style option ie 2 earcups. As it's name suggests, the D10 Phone II connects to a desk phone only. It comes with a headband and earhook wearing style included in the box. Being a DECT unit it gives the best range, allowing you to wander 55-70m in a typical office (up to 180m line of sight).