It has been included as part of the 4-SMD Module package in the interest of convenience. Ensure reliability by setting the transducers' temperature to -40°C~85°C. With a supply voltage of 2.5V~12V the transducers can operate effectively. In order for the transducers to work, the 4 pins need to be connected. A pressure range of 1 Psi is the maximum range set by this transducer. For the transducers to work effectively, the voltage release should be 45mV. Transducers should have a DC voltage of 10V so they can run continuously at ambient temperatures.