1.25-26V Digital Display Step Up Step Down DC -DC Power Supply Module Step-up mode: Input 3.5-28V, output: 1.25-26V Output voltage is irrelevant to input voltage (input 3.5-28V with arbitrary value, output 1.25-26V with arbitrary value) Voltage regulating mode: (Step-up) Potentiometer rotates in clockwise, (Step-down) Potentiometer rotates in anticlockwise