1.This is a downward power supply module. It can be used as a battery charger for solar panels, wind turbines, etc. Equipped with a current limiting function that does not cause the module to burn out even in the event of a short circuit at the output. The integrated voltage and ammeter are selfcalibrable. 2.Features: Builtin voltage, current and power meters. Builtin USB interface for charging digital devices. High power, high efficiency, 5A, low ripple. 3.There are two modes: constant voltage and constant current. Indicator lights indicate the current mode of the module. When used as a lithium battery charger, trickle charging voltage and charging current can be adjusted. An indicator light indicates whether the module is charging or is fully charged. 4.Note: The USB output voltage is equal to the module output voltage and is not a fixed 5V output. The input and output mass of the module should not be interconnected, otherwise the current sampling resistance of the module will be bridged and the module can no longer adjust the output current. When a load is connected, the module can easily burn out.