Brand new.

Descriptions: Integrated voltmeter, buck voltage converter and 5V USB charger port, multifunctional and practical. Wide voltage measuring /input range: DC 4.5-40V; with self calibration, high accuracy. "Output Enable" button for usb output and "low power" button for low power-consumption mode. With reverse connection, over-current and over-temperature protection, hence safe for use. With LED indicator for USB power supply

Parameters: Input voltage/ voltmeter range: DC 4.5~40V (please input voltage 6.5 ~ 40V , then can get a 5.0V stabilize output) Output voltage/current: 5V/2A Module dimensions: 58mm * 21mm * 10mm (LWH)

Instructions for use: After power-on, the voltmeter displays, if you need to charge such devices as phone, Tablet PC, MP3, press the "Output Enable" button, then the USB power indicator lights, USB output 5.0V; if you need to turn off the digital display, press the "low power" button, then enter low-power standby mode and USB output shutdown.

Voltmeter calibration method: 1.when the voltage meter display, 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, reduce one voltage reduction unit(one unit is less than 0.1V) 3.After the voltage adjustment is completed, please press the "Output Enable" button for 2 seconds then release, exit voltage calibration mode. If power off, parameter setting will automatically save.

Applications: 1.Car / motorcycle battery voltage monitor or other voltage measurements 2.USB Charger for Mobile phone, MP3, Tablet PC or other electronic products

Please Note: This module defaults to D+,D- shorted, compatible with most of cell phone charging, if you need to install identification resistor such as for IPhone, please cut off the red line position

Package include: 1x DC/DC Converter Digital Voltmeter Display USB Charger