If you have read my blog for a long time you may have seen some of my dream bondage device posts, which are basically fantasy bondage devices that have shown up in my twisted dreams when I sleep.
A while ago I made a post on using In ear monitors for sensory deprivation. Basically, wireless earplugs/headphones that could be used so that the Mistress could control what you would hear, whether it was a microphone of her voice pumped directly into your ear, white noise, a hypnotic mantra, music, etc. In my dream these monitors were held in place by a pair of earmuffs (that had a locking chin strap).
This year a few designers have made this at least a half-reality by cutting out the middleman and putting the speakers directly into the earmuffs. Almost there... now they just need them to block out almost 100% external sound, be wireless, and incredibly difficult to remove if secured.