Mr.Power 3.5 Postive Tip Power Supply Converter for Electro Harmonix EH DOD Guitar Pedals Convert 5.5mmx2.1/2.5mm to 3.5mm(1/8), As pictures To power Electro-Harmonix, older DOD, and other pedals that require a positive tip 3.5mm (1/8) plug. Works with 9V 5.5mmx2.1/2.5mm negative center power supply, such as BOSS PSA Power supply. Length: 12cm