This has to be the most valuable response. Thank you. Continued...
Cassette tapes work with a headphone (3.5mm) jack, that every(thing/one) nowadays has. now that everybody has a way to connect to an audio system, wouldn't it be great to hook it up with Bluetooth..."like everyone with a smartphone now has?" for those of you who have used Bluetooth to control your music, you know...there is no better way to play music! either way, have it or not, wouldn't it be cool to have a Bluetooth Gadget/Widget/Box that can connect with the 3.5mm jack that works with your music player (home sound system, car, stereo, TV) like a usual Bluetooth device (>>,>,II,<,<<, and one more button)? no matter if you have an Android or iPhone or WHATEVER, you can bring the BOX with you. This is NOT a music player. It's an ADAPTER between SPEAKERS and your UNLIMITED music LIBRARY. All you need is something that makes music LOUDER (than your phone, comp, iPad/iPood). TVs, stereos, cars, are accessible in a lot of situations so please give this some thought
3.5mm jack can always PLAY ON and FROM and convert from/to (for under $3):
-RCAs...red and white (works in hotels 100% of the time in 100% of the world)
-3.5mm male or female...your regular headphone jack
-cassette tape (god bless your vehicle)
-98% of TVs & radios nowadays
-if you can't find one around you...MOVE your **** off the couch and find one OR find someone who'll do it for you

cheers.