The SW-R600 Climbers Satelite Switch is for mounting on the upper flat section of the handlebar, or any other location comfortable for the rider. They can be used by plugging directly into a SM-EW90-A 3-Port Junction or SM-EW90-B Dura-Ace 5-Port Junction, or in addition to a Dual Control Brake Lever/Shifter. The cable is approx. 27cm long.