The Triple Output DC Power Supply models,BP447266, BP447267 have the following: Two 0-30 VDC, 2A (1760A) sections capable of independent, series or parallel operation;Two 0-35 VDC, 3A (1761) sections capable of independent, series or parallel operation;One 4-6.5 VDC, 5A section (1760A);One 2-6.5 VDC, 5A section (1761);Switchable series/parallel operation 30V sections; Adjustable current limit controls 30V sections; Two 4-digit LED displays; one reads volts or ampls of ''B'' supply; one reads volts or amps of ''A'' supply or one third output 4V-6.5V supply, and Unique variable tracking; B track A at 5 to 100%. Models, BP447268, BP447303 have the following: Two 0 to 24 VDC outputs (0.5A); One fixed 5V output (4A); Independent or tracking operation; Adjustable current limiting; Designed to operate continuously at rated output; Short circuit protection, overvoltage protection, reverse polarity protection