3-wire servo extension cable 40" (100cm) long, 24 AWG stranded wire. Added to the 12" cord that comes with most standard size servos you can power a switch up to 4 feet from an Octopus or Quad Servo board. How many of these can you daisy chain together? In an experiment I daisy-chained 15 extensions and found that the servo still worked OK. At 20 extensions, the servo threw but could not hold against back-pressure. So I would say up to 15 - that's 50 feet.