http://thinkgeek.com/images/products/other/a94c_amplug_VOX_guitar_amp_grid_embed.jpg
They're around £20-£30, plug into the guitar's jack and let you "rock out on Headphones"
― Mark G, Friday, 11 June 2010 10:57 (fourteen years ago) link
Demo of the AC30 version - he swears a little at the beginning so not entirely SFW.http://www.youtube.com/user/ShortScaleGearDemos#p/u/15/gYbS7ZIZ1Ag
― Fat Dog Franklin (snoball), Friday, 11 June 2010 10:59 (fourteen years ago) link
^^^ he also explains the differences between the versions
― Fat Dog Franklin (snoball), Friday, 11 June 2010 11:02 (fourteen years ago) link