Electro Harmonix is a company that makes various effects pedals for guitar. They have several delay models with the name "Memory Man". I've got two of these - the classic Deluxe Memory Man made famous by U2 guitarist, the Edge. The second is a more modern version called the Stereo Memory Man with Hazarai Delay. This is a short, improvised guitar piece using the two pedals in combination. The Stereo Memory Man is used for looping.