If this looks like a picture of an old-fashioned cassette player, look again. It’s actually a cool, new MP3 player from Digisette. Play your favorite music from memory cards and listen through earphones, or just slide the whole unit into a cassette player. The DUO-Aria lists for $250 and is capable of converting digital signals while working as a tape emulator, so it can play back through your car audio system or your boombox at the beach. Additional information is available at www.digisette.com. For more must-have gadgets, log on to www.technogadgets.com.