The BK Precision 1651A Triple-Output DC Power Supply, (2)24V/500mA, (1)5V/4A is a power source that uses two supplies with a 0 to 24 volt DC output and one supply with a 5 volt DC output. Two LED indicators regulate the output current and output voltage. This model is designed to operate continuously at the rated output. Connect outputs in series for higher voltage or connect in parallel for higher current output (switch selectable).