DZS Elec DC-DC Buck Constant Voltage Converter 4.5V-40V to 5V 2A USB Output Voltmeter Step-Down Module for DIY USB Charge Board, Voltmeter Monitor, Voltage Converter;

Feature:
Name: Voltmeter +5V 2A USB Charing 2 IN 1 Step-Down Converter
Input Voltage/ Voltmeter Range: DC 4.5-40V (Input 6.5-40V voltage, output 5.0V stable voltage)
Output Voltage/ Current: 5V/2A
Protection Function: Reverse polarity protection, Over-current protection, Over-temperature protection
Output Indicator: USB power supply output indicator
Connection: Terminal

Instructions:
1. After power-on, the voltmeter display input voltage.
2. If need to charge phone,Tablet PC, MP3 , please press the "Output Enable" button next to IN-, then the USB power indicator lights, USB output 5.0V voltage.
3. If need to turn off the digital display, please press "Low Power" button next to IN+, then enter the low-power standby mode, voltmeter and USB output shut down.

Note:
1. This module default D + D- short, most of the cell phone charger is compatible, and set aside a variety of mobile phones identification resistor installation location, if you need to add the identification resistor, please connect D + D- wires cut,then added.
2. Please makde sure the input voltage within the work range.

Calibration:
1. In the normal working status, long press "Output Enable" button 2 seconds then release, voltmeter flashes.
2. Touch the "Output Enable" button, the voltage increases one unit, touch the "Low Power" button, the voltage reduce one unit(one unit is less than 0.1V)
3. After voltage adjustment, long press the "Output Enable" button for 2 seconds then release. If power off, parameter setting will automatically save.

Packakge:
1pcs DC 4.5-40V to 5V 2A Voltmeter Buck Converter with USB output