If you've already got a couple of Boss FS-6 pedals and an AirTurn BT-106 transceiver, here's the AirTurn solution to turn these in to a 4-pedal solution. Stereo cable for Boss FS-6 dual pedal to connect to AirTurn BT-105/106 or BT200 transceiver. Note: this is a single cable. Two cables are required for 4 pedal use.
Dimensions: 8x6x0.5 inches (20.32 cm x 15.24 cm x 1.27 cm)