The SH-950/951 sensor system from Shadow is a system with one or two pick-ups, where each pick-up is equipped with two sensors, which are placed between the recesses of the cam. A copper foil is also supplied for this to fix the sensor if there is too much space. The socket with 6.3mm jack connection is mounted on the tailpiece with Velcro. You can choose between 1 or 2 pick-ups.