DC 4.5V-40V to 5V 2A Step Down Module digital Voltmeter 5 V USB Charger Power Supply module

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.Feature: 1.Voltmeter wide range: DC4.5 ~ 40V. 2.5V/2A output current (Only when the input voltage is 6.5 ~ 40V, it can output 5V). 3.A key ("Output Enable" on) switch USB output, a key ("low-power" on) to enter the ultra-low power. 4.Voltmeter can be artificially calibrated, will never exist voltmeter inaccurate problem! 5.With reverse polarity protection, reverse polarity does not matter. 6.With over-current, over-temperature protection. 7.With USB power indicator. 8.Equped with terminals to facilitate wiring. 9.High efficiency, low rple. Use Method: Module is connected to power, the voltage can be detected in real time.When you need the phone, AD, MP3 and other digital products charge, click the "Output Enable" on,then USB power indicator lights, USB output voltage 5.0V.When you need to turn off the voltmeter, click the "Low Power" on, then enter the ultra-low-power standby mode, USB output corresponding shutdown. Applications: Wide input voltage, for car / battery car / motorcycle used for monitoring battery voltage; measure the voltage needed for a variety of occasions. The output current capability 5.0V/2A, enough to meet a variety of USB devices, voltage is very stable. Voltmeter calibration method: Step 1, Pre the "Output Enable" on more than 2 seconds, release, voltmeter flashes, this time into the voltage regulation mode; Step 2, pre the "Output Enable" on (normal speed), the voltage value is adding up a unit; Pre the "Low Power" on, minus a unit; Due to a unit is le than 0.1V, the minimum voltage display to 0.1V, so you need to continuously pre 1-5 times to see the voltmeter change 0.1V, how many times voltmeter change 0.1V by preing the on, depending on the current display voltage, the higher the voltage, the fewer the number of pre. Step 3, pre the "Output Enable" on more than 2 seconds, release, to exit the voltage calibration mode.Data is not lost after power fai.

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