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I’ve seen various gadgets, including phone backup batteries, used as keychain fobs, but this is the first Bluetooth speaker key fob I’ve seen. The BluGo Bluetooth speaker from Triple C is only 2.25″ in diameter and 1″ thick. It comes with a ball chain to clip onto your keyring or bag strap. It has a rechargeable battery (2 hours to a full charge) that gives you 3 hours of playback. The BluGo is available in a variety of designs, from the colorful Dali seen here to animal prints, floral, and even camouflage designs. The BluGo Bluetooth Speaker is $39.99 at Triple C.