The 1550 is a compact 108-watt switching DC power supply delivering 1-36 VDC at 0-3 A from its main isolated output, featuring a unique USB charging port on the front panel for charging mobile devices. The unit provides excellent voltage regulation with ±50 mV load regulation and ±20 mV line regulation, along with low ripple of ±5 mV rms and noise of ±50 mV peak-to-peak, while the USB output delivers 5V at 400 mA with 8 mV ripple. Key features include constant voltage and constant current operation modes, a large bright LCD display with 3-digit voltmeter and ammeter, comprehensive protection against short circuit, overload, over-temperature, and overvoltage, and an 80-120 kHz switching frequency for quiet operation. The 1550 is ideal for laboratory benches, workshops, and educational settings where compact design and clean power delivery are essential, with its integrated USB charging capability adding practical convenience for users.