Boss Katana MK1, MK2 & Artist footswitch Preset Display and a 9Vdc Power Supply | eBay
Boss Katana 50 MKII 1x12 Combo with FS6 Footswitch at Gear4music
Amazon.com: XSONIC Airstep Kat Edition KATANA MkII & I Footswitch with 5 Footswitches, 2 Control Modes(Change Presets, Toggle Effects), 300H Playtime, Modify Amp sound with BTS App for iOS and Android, Wirelessly :