The FSR 400 short-tail model is a single-zone Force Sensing Resistor® optimized to use human touch to control devices for use in automotive electronics, medical systems, and industrial and robotics applications. FSRs are two-wire devices. They are robust polymer thick film (PTF) sensors that exhibit a decrease in resistance with increase in force applied to the surface of the sensor. This device has a 5.6 mm diameter active area and is available in 4 connection options. Interlink Electronics' FSR 400 series is part of the single zone Force Sensing Resistor family.