There is not an official Fretlight Footswitch for the wireless guitars just yet. While most "wireless page turners" may work with our apps we have only tested the PageFlip Cicada Bluetooth Foot Pedal and the iRig BlueTurn. At this time you will need to purchase one from a third-party store as we do not carry these items.
The wired Fretlight Dual Footswitch will not work with the wireless system. The only app that is compatible with a wireless footswitch is currently the Fretlight Chord & Scale Library.
If you are looking for the Wired Dual Footswitch for the FG-400/500 Wired guitars you can find it on the following linked page.