b' Features: Easy to use and connect the cable, with good performance. Knob operation, immediately after adjusting the response output, without delay. The power port has a polarity for protection function, which will not damage the components when the power supply is reversed. Power supply voltage: for DC 12V or 24V (tolerance 25%), total power <1W.Output load impedance range: 0-350 ohms (DC12V); 0-800 ohms (for DC 24V). The test output is normal, you can use a multimeter to short-circuit the 4-20mA output terminal. Can be used for signal source, for valve adjustment, output instrument test, light-emitting diode test, analog transmitter. Specifications: Power supply: for DC 12V or 24V Current: 4-20mA Total power: <1W Output load impedance: 0-350 ohms (DC12V); 0-800 ohms (for DC 24V) Board Size: approx 50x 50mm / 1.97x 1.97in Product weight: 38g / 1.37oz Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1 x 4-20mA Signal Generator Module'