B&K Precision 1688B Switching Bench DC Power Supplies, 1-18V, 20A Switching power supply unit provides a constant source of DC voltage and current for powering and testing electronic devices LED screen shows voltage and current reading simultaneously and is readable in low light Rotary encoder control knobs for fine and coarse adjustment of voltage and current output Internal memory stores up to three output settings for future recall Analog remote control terminal and USB interface for remote control