The Okii Systems USB Follow Focus is less than 3 in. (7.6 cm) in diameter, weighs under 5 oz (142 g), and runs on two AAA batteries
With the Okii Systems USB Follow Focus, photographers and videographers can remotely control their Canon EOS HD DSLRs. The compact remote device uses Canon’s built-in USB capability to operate many camera functions including focus (even while recording video), record start/stop, shutter release, and more. Built in a rugged, compact case, the Okii USB Follow Focus eliminates the need for a bulky mechanical setup or being tethered to a computer.