Adding to the ever-growing pool of nearly identical Bluetooth in-ear headphones we've seen since JayBird released BlueBuds X, JBL has released J46BT ($80) as yet another option. Just like MuseMini's UberBuds down to the included proprietary USB charging cable, the bullet-like earpieces connect to one another with flat rubber cabling, have a three-button remote and mic unit, and promise between 2.5 to 5 hours of playback time between charges. Offered…