The BK Precision 1550 Switching DC Power Supply with USB Charger, 36V/3A, 230V Line Input delivers 1-36V and 0-3A from its main isolated output. A unique feature of the 1550 is the USB charging port located on the front panel allowing the user to charge a cell phone or MP3 player. Clean power and quiet operation make this power supply ideal for any bench in laboratories, work shops and schools where bench space is limited.