We have been selling these units for many years as they are a reliable, efficient charger that is a good value for your money. This unit is actually a constant voltage switching regulator. It can be used as a DC power supply with no batteries if desired. No special filters are required for radios and stereos. They operate at a wide range of input voltages and frequencies and still maintain full power output and constant voltage.
The DLS series converter/power supply meets FCC criteria, ...