Roger Mayer Voodoo TT Dual Band HDD Guitar Effect Bypass Switch: We only use USA Carling Switches considered the best. LED: Indication of status of the unit. Hard Wire or 2 Buffered Outputs essential for trouble free interfacing for all situations. Easy Battery Access just slide the cover back to reveal the battery. Could not be faster. Standard DC Powering Jack allows the use of commercial powering units. Extra internal filtering ensures low noise performance and the standard polarity convention is maintained.