Module nature: isolated buck regulator Input Voltage:DC12-90V Output voltage: DC9V Output ripple: 100mV (output 12V 2A measured) Input reverse protection: Yes Output short-circuit protection: Yes (instantaneous protection, can not be short-circuited for a long time) Conversion efficiency: about 88% (48V to 12V 2A measured, pressure difference between different efficiency changes) Notice: 1. This module is a constant voltage power supply without constant current and cannot be directly driven. Load that requires constant current drive cannot be directly used for charging. 2. This module can reduce voltage and stabilize voltage while also boosting voltage, but its load capacity is reduced by half when used as a boost. Color: As Shown Material: PCB Package Contents: 1 * Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.