1. input voltage range:3~35VDC(Note: the input voltage is less than 4V, voltmeter failure) 2. input current:9A (max) 3. output voltage range:3.5~35VDC(please to ensure that output voltage above on input voltage) 4. output current: 6A (max) 5. output power: 75W (when the input and output voltages greater than 20V up to 128W) 6. conversion efficiency: 96.4% (max) 7. voltmeter range: 4 to 40V, error 0.1V 8. short circuit protection: yes(limit current 14A). (Note: connected to high-power load, just switched on the impact of current very general meeting current limiting self-locking protection, it is recommended to be switched on firstly, and then access the load). 9. input reverse polarity protection: None (if required, high current diode in series with the input). 10. L x W x H = 67 * 43 * 12mm Features: 1. LED power indicator. 2. Button to switch measurement of the input or output voltage, and LED indicates the current measurement of the input or output voltage; The nixie tube can be turned off by another button. Mentioned states are able to be memorized, is not lost even if the power is disconnected. (On-board marked "IN" LED is turned on, the nixie tube display input voltage value, "OUT" LED bright display is the output voltage value). 3. Special launch, the voltmeter calibration function, will never exist voltmeter inaccurate! Voltmeter calibration method: