- XSonic Airstep SPK Edition - Wireless Footswitch for Positive Grid Spark Amp, smart multi controller / wireless footswitch for Positive Grid Spark Amp, no setup required, works out of the box, adds a footswitchable looper function (requires separate looper app), switches Channels, Drive, Mod, Delay and Reverb via Bluetooth, 4 selectable control modes with different footswitch assignments, Spark app can be used simultaneously when footswitch is connected, rechargeable battery guarantees 300 hours of wireless use between charges, 5 footswitches with status LEDs, 30 m (98 ft.) wireless communication range, battery powered and rechargeable by 5V - 9V DC (200 mA), Power On/Off switch, power supply via optional 9V DC adapter, 2.1 mm x 5.5 mm barrel plug, polarity (-) center, robust aluminum extruded shell, dimensions (L x W x H) 300 x 70 x 45 mm / 7.67" x 4.84" x 2.36", weight 650 g / 1.43 lbs, USB-barrel plug adapter (charging cable) included in the delivery, Note: Positive Grid and Spark Amp are the trade names, trademarks or service marks of their respective owners.