This is a 4-loop switcher from EXECTIVE SOUND (formerly Lagoon Sound), featuring 2 loops plus an A/B selector. It does not have a program function. The upper right and left loops can be switched ON/OFF individually, while the lower right and left loops are switched using the middle switch, making for a simple design. It uses a 9P 3PDT true bypass switch and is very well-built. It runs on 9VDC and can also be powered by a battery, accessible by opening the back cover. There is a slightly large scratch on the surface, but it functions without any problems. This listing is for the unit only.