In order to make your life easier, a 4-SIP Module package includes this transducer. If you want reliable results, you should set the transducers' temperature to -40°C~85°C. Supply voltages as low as 2.5V~16V work well with the transducers. Temperatures of 85°C are the maximum operating temperatures of the transducers. It is impossible to operate the transducers below -40°C. 4 pins must be connected in order for the transducer to work properly. In the case of transducers, a maximum voltage of 16V can be applied without causing damage.