For teaching blood pressure skills, PDA technology brings you a device for training. This unit is a stand-alone feature that is allows you to incorporate placement of the sphygmomanometer, radial pulse palpation, variable pressures in both diastolic and systolic in two mm increments, variation of sound amplitude that is heard at the antecubital site. It also includes a sound jack to encourage group listening, heart rate settings, and a auscultator gap setting. To save on battery life, the training can be plugged into a 110 volt a/c. It included adapter jack.