?HIGHER PRECISION WITH DATA HOLD FUNCTION - It is more precise to switch between coarse and fine tuning only by pressing one adjusting knob lightly from 0 to 30V, 0 to 5A. To press two knots 3 seconds simultaneously for holding a set of values and then press 3 seconds to release ?4 DIGITS READINGS WITH BACK-LIT LED DISPLAY - With a 0.01V and 0.01A resolution, 4 digits provide more accurate and clearer visible readout for the voltage and current value, extremely durable and easily visible even in low-light usage, meeting the needs of most people, ideal for small labs or the hobbyist at home ?HIGH-QUALITY WITH ESSENTIAL SAFETY - Grounding wire, thermal protection, voltage overload and short-circuit protection ensure the safety; The built-in fan reduce the operation noise, prolonging the life of product effectively ?CONSTANT VOLTAGE & CURRENT OPERATION MODE - Easy to dial in the desired voltage with the encoded-controlled fine and coarse adjustment knob, can easily see the amperage and voltage change as circuit components are switched in and out ?WHAT YOU GET - 1 x MDC01 Power supply host , 1 x Output power cord , 1x Input power cord , 1 x User manual