Even though we took a look at the Invisio G5 in December 2007, Invisio is officially showing what it's calling the world's smallest Bluetooth headset at CES this year. This tiny little thing measures only 1.3 by 0.63 inch, and weighs about 0.211 ounce. Much like the Q7, the G5 has the unique Soft Spring ear insert that lodges right in the ear. The G5 comes with a protective charging case that looks a little like a big cigarette lighter. Even though the headset itself has about 4 hours of talk time and 6.25 days of standby time, this portable charging case increases that to about 20 hours of talk time and 30 days of standby time. The G5 is available now for about $129.