Description: 【High Performance】: DC-DC buck boost converter, LCD can display input/output voltage, output current/output power/output capacity/output time. 【Features】: Adjustable regulated power supply module, numerical control adjustment, accurate and fast, can step up or down, the output voltage can be adjusted 0.5-30V, and the current limit can be adjusted 0-4A. 【DC-DC Buck Boost Converter Module】: The input end is protected against the connection, and the connection will not ; the output end is protected against backflow, so there is no need to add an anti-backflow diode during charging. 【DIY Solar Battery Charging Module】:The module can be set to be turned on/off by default; it has a variety of software protection mechanisms and the protection thresholds are adjustable. After the module operating parameters exceed the protection threshold, the output is automatically turned off. 【Variable Voltage Regulator】:The output is small and has π-type filter; Thickened heat sink. Specification: Working frequency: 180KHZ Material: Plastic Product Size: 79mmx43mmx26mm Package Includes: 1 Buck Boost Converter Note: Please allow slightly errors due to manual measurement and different monitors.