Parallel connection mode Double current expansion output in parallel mode. Example 30V 10A up to 30V 20A. One key switch series parallel Say goodbye to complex wiring and setting, by pressing "SER/PAR" arbitrarily switch series and parallel, super convenient ! Encoder knob: This product button uses encoder knob, you can directly set the voltage and current value rather than adjust, very convenient and accurate. Multi-protection functionsEquipped with grounding wire, overheat protection, overvoltage protection, overcurrent protection and short circuit protection to ensure safety; after testing, it can maintain full load operation for more than 24 hours. The built-in smart cooling fan can reduce noise and effectively extend product life. High-quality materialsUsing pure copper terminals, with good conductivity. High-quality cables are used internally to ensure the safe operation of the machine. Using high-quality hardware makes our products more precise.