Sennheiser introduces two foldable headphones, the PX 100-II and PX 200-II. The former is a pair of mini headphones with an open design offering a frequency response ranges from 15 to 27,000 Hertz while the latter gets a closed design and has a 10 to 21,000 Hertz frequency response.
These headphones both have a “fold and flip” design, which means that you simply close the headband, fold in the ear cups and the headphones are then small enough to pack away into the handy transport pouch. They both have supra-aural ear cushions and a 1.2 meter long single sided cable. The PX 200-II includes also an in-line controller.