Features: Precisions voltages regulator, the output accuracy of ≤1% Wide operating voltages rangesAutomatic over voltages protections, if the output voltages is higher than the normal output voltages, will automatically cutoff the power output to ensures that your radio security. Automatic over current protections, if the output current is greater than the maximum or load short circuits , it will automatically cutoff the power output, to ensures that your power will not burn out. Technical performancesInput power supply voltages: AC220V ± 10% Maximum output current: 30AOutput Load Accuracy: ≤2% Specifications: Component:ABS Size: Approx.155x7x205mm/6.1x2.76x8.07inch Color:Black Input voltages:220VAC Output voltages:13.8DC adjusted voltages between 9.0 and 15.0volts. Turn clockwise to increase and counter clockwise to decrease the voltages.When it is set at the center positions it will supply 13.8volts. Output voltages regulation:less than 2%. Short circuits,Automatic current limiting With in 30A. Fuse:5A. Meter:single voltages/current meter,backlits. Dimension:155(W)x70(H)x205(D)mm (projections not included) Weight:approx.1.5kg. Package Includes: 1pcs Adjustable Switching Power Supply 1pcs Power Cable 1pcs User Manual note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. ②.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.