Features Easy To Adjust: This automatic wide voltages regulator is designed with an adjustment knob, which can be used to adjust the MPPT voltage, output voltage and limit the output current in a very simple way. LED Display Screen: This automatic buck boost converter adopts LED display screen, which can clearly display the input voltage, output voltage, temperature, output current, output power (key switching). Stable Working: This automatic bucking boosting converter module has good heat dissipation performance, which ensures stable working performance under high power, and is very efficient and reliable. Over Power Guard: This boost and buck converter module has an over power guard function, when the power exceeds 700W, it will shut down the output and display OPP, which is very safe and reliable. Wide Application: This adjustable voltage module has a wide range of applications, supports MPPT regulation voltage real time control, boost and buck converter operation is very simple, widely used in solar charging, battery lithium charging, LED constant current driver, voltage regulator and so on. Specification: Item Type: Automatic Buck Boost Power Supply Module Material: PCB Model: ZK-SJ30 Output Current Adjustment Range: 0-30A Current Display Range: 0.00A-30.00A (Accuracy ±0.03) MPPT Function: Yes (External fan required for use with high current) Anti Reverse Connection: Yes, no diode required when connecting to battery. Constant Current (Current Limit): Yes Overpower Guard: 700W, output shuts off and displays OPP when power exceeds limit. Package List: 1 x Automatic Buck Boost Converter Notice: 1. Do not connect the positive and negative terminals backwards, otherwise it will burn out. 2. When connecting the battery to the output terminal, do not connect the positive and negative terminals backwards, otherwise it will burn out. 3. The maximum output current of 30A is only available when the input voltage and output voltage difference is small, and the output power does not exceed 700W. The greater the voltage difference between the input and output, the lower the conversion efficiency and the more serious the heat generation. When the heat generation is too serious, please reduce the power usage or add a 12V fan (with reserved interface, the fan current is less than 200mA) to assist in heat dissipation. Package List 1 x Automatic Buck Boost Converter