You Rock Guitar YRG-1000 &lt; Gen2 &gt; Firmware has been tweaked for a more musical experience. The new Layer and Zone structure allows two sets of sounds to be mapped on the fingerboard per user selection chorus effect, transposition, pan, zones can be stored per layer in the 99 presets. Detachable 22 fret guitar neck for portability Uses 4xAA batteries or USB power (sold separately)