Voodoo Lab Y- 18Volt/24Volt Cable, 5.5mm x 2.5mm - Reverse Polarity (straight), Combines two Pedal Power outputs (both in 12V mode) to create 24V. Used to power various Electro-Harmonix effects like the Deluxe Memory Man, Stereo Memory Man, Deluxe Electric Mistress, Micro Synthesizer, Bass Micro Synthesizer, Q-tron, Q-tron +, Stereo Polychorus, and Worm pedals. (Also powers the Flanger Hoax which uses this reverse polarity cable, but only requires 18V (set both Pedal Power outs to standard 9V), length: app. 50 cm