This is a vintage 1983 Boss TW-1 “Touch Wah” electric guitar effects pedal. This particular example, serial number 331700, is in MINT all original condition and includes the original box as well as the original instructions. With only two controls and a switch, the T Wah is both extremely easy to use as well as versatile. Interestingly, the TW-1 and the CS-1 are the only Boss pedals to ever feature a toggle switch. This example is in perfect working order.