Features: Easy to use and connect thewire, good performances. Knob operation, immediately after adjusting the responseoutput, no delay. The power port has polarityprotections, will not damage the components with power reverse. The test output is normal, you can use a multimeter shorted "4-20mA output" terminal. Can be used for signal sources,adjustment, output meter test, the light emitting diode test, analog transmitter. Specifications: Voltage：DC12-24V Total Power :less than 1W Current：4-20mA Output Load Impedance : 0-350ohms(DC12V); 0-800ohms(DC24V) Size:As pictures Package Includes: 1PCx Signal Generator Module note: Due to the light and screen setting difference, the item color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.