A-szcxtop(tm) USB to Midi Keyboard Interface Converter Cable Cord Adapter for Pc Computer In stock, a worker yesterday delivery.Since free shipping, it needs about 7-14 working days for shipping. Easy to install with built-in driver; USB powered, no AC adapter needed 1 in + 1 out MIDI interface; 16 MIDI input channels & 16 MIDI output channels LED power indicator; MIDI in & out signal indicator; Supports: Windows Vista/XP and Mac OS X