DROK USB Voltage Regulator, DC 3.5V-15V to DC 0.6V-30V Buck Boost Converter, 5v to 3v 12v 24v 2A 15W Step Up Down Power Supply Module, Digital Voltmeter Ammeter

* PER Mode --- used as a USB buck boost converter with constant voltage and current function, input voltage range DC 3.5-15V, output voltage range DC 0.60-30.00V, output current range 0.000A-2.000A, max output power 15W. * VAH Mode --- used as a multimeter to measure and display voltage, current, power, capacity, energy, time and temp, detect fast charge protocol. Input voltage range DC 3.0-15V, volt measurement range DC 0.00-50.00V, amp measurement range 0.00-3.000A. * PWM Mode --- output PWM signal, adjustable frequency, duty ratio, amplitude. * Support Fast Charging Protocol --- QC 2.0, QC 3.0, Huawei FCP/SCP, Samsung AFC. * Temperature --- can be switched between Fahrenheit and Celsius.