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The USB VFO knob allows you to change the VFO setting of the radio when plugged into a supported device with a USB cable. Works with PC, Mac and most phones/tablets. Phones and tablets usually require an additional OTG USB port adapter. The VFO knob has been enhanced with additional internal weights and o-rings have been added for better grip. It is mounted on an adjustable cell phone stand so the operating angle can be adjusted to personal preference. Works very nicely with the new Icom spectrum scopes.
(Click on image above for high resolution view.)
More info on Knob programming (which has already been done.): Knob Programming Details