This is a Force sensitive resistor with a square, 1.75×1.5″, sensing area. This FSR 406 will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance.
Electronics FSR 406 model is a single-zone Force Sensing Resistor optimized for us in human touch control of electronic devices.Force Sensing Resistors (FSR) are a polymer thick film (PTF) device which exhibits a decrease in resistance with an increase in the force applied to When no pressure is being applied to the FSR its resistance will be larger than 1M?. This FSR can sense applied force anywhere in the range of 100g-10kg. Two pins extend from the bottom of the sensor with 0.1″ pitch making it bread board friendly. There is a peel-and-stick rubber backing on the other side of the sensing area to mount the FSR.