Sennheiser, maker of high-end consumer and professional audio gear, announced yesterday the addition of two Bluetooth headsets to their lineup, the PXC 310 BT and PX 210 BT. Both models have onboard media controls, a folding design for travel, rechargeable lithium polymer batteries, and include an adapter and cable for listening to devices that do not have built-in Bluetooth or in situations (such as on an airplane) where the use of wireless devices is inadvisable. Both models support the apt-X codec, which is advertised as providing better sound quality, but are capable of falling back to standard A2DP if apt-X is not available. The PXC 3310 BT also features Sennheiser’s NoiseGuard 2.0 active noise cancelling technology. No price has been provided, but they should start showing up in stores this month.