This cable seems to have a mind of its own. I purchased the largest pair available therw venders on Amazon. I purchased these slippers to wear to/from our neighborhood pool, 2-3 minutes away. So just as the DT770 they NEED an amp - or audio interface with a HP out. The bottom shoe would either stich out or you risk getting it squashed. At this point the Brainwavz earpads are well known and well regarded in terms of comfort, quality, and sound. I get closer to the 6 or 7-hour mark than 8 hours before (Usually the right earpiece) starts the annoying "BATTERY LOW" drone, which repeats 5 or so times over the course of a few minutes, then BOTH earpieces shut off. 2 Gb\s. This happens even if the other USB devices in the room are turned off. 5 size pair now.