DC-DC Buck Step Down Power Module 5V USB Charger with LED Digital Display

When you need to charge the mobile phone, iPad, MP3 and other digital products, touch the “output enable” button, then the USB power indicator light on, the USB output voltage 5V; When you need to turn off the digital tube, touch the “low power” button, then the module into the ultra-low power standby mode, USB output is also turned off accordingly.Feature:The voltmeter has automatic calibration function.With reverse connection protection.With overheat protection and short circuit protection.With USB power indicator light.High efficiency and low ripple.Specification:Model: YS-04Name: Step down voltmeter moduleInput voltage: DC 4.5 ~ 40VOutput voltage: 5V (when the input voltage is between 6.5V ~ 40V)Output current: 2ASize: approx. 5.7 x 2 x 1cm(L x W x HApplication:Cars and Electric BikesMotorcycle for voltage measurement and to charge the phoneiPads, Mobile PhonesMp3 DevicesVoltmeter Calibration Method:Step1: Press the “Output Enable” button more than 2 seconds, release, voltmeter flashes, this time into the voltage regulation mode;Step2: Press the “Output Enable” button (normal speed), the voltage value is adding up a unit; Press the “Low Power” button, minus a unit; Due to a unit is less than 0.1V, the minimum voltage display to 0.1V, so you need to continuously press 1-5 times to see the voltmeter change 0.1V, how many times voltmeter change 0.1V by pressing the button, depending on the current display voltage, the higher the voltage, the fewer the number of press.Step3: press the “Output Enable” button for more than 2 seconds, release, to exit the voltage calibration mode. Data is not lost after the power failure.