I have tried more than a dozen Bluetooth earbud form factors, but the one I absolutely love for everyday use is the Jaybird Freedom Sprint / Plantronics Backbeat Go 2 design. Two small earbuds, one wire, and all the freedom you can think of. It's less cumbersome than the dog tag design (à la Jabra Tag) and lighter to carry around than the necklace style (think Samsung's Gear Circle or LG's Tone series).

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