GOTOBUYWORLD QW-MS3010D 30V 10A Adjustable DC Stabilizer Power Supply (US Standard) Portable size, practical and convenient to operate;Auto shift between voltage stabilization and current stabilization It has rather low ripple voltage;LED screen displays output voltage and current Selectable over-current protection, widely applied to daily fields;Adjustable design could meet your various demands With 4pcs potentiometers, respectively for output voltage and output current;High precision and stability Warehouse:US,Ships in 48 hours