Red LED Digital Display Voltmeter Panel Mini Battery Tester for DC 12V Cars Motorcycles USB 5V2A Output AC Power Supply

Differences between several versions 12V models: display mode for red + green power bar / digital voltage display dual USB port, can be used for 12V battery and 4 series lithium iron batteries. 12.6V lithium batteries can also be used, but the power display will be less. 24V power models: digital display of 10 files of the percentage of power: 00,10,20,30,40,50,60,70,80,90,100 no voltage display function. No voltage display function. 48V power/voltage model: Cyclic display/10 seconds of voltage, then display 10 seconds of power percentage, undervoltage alarm flashes when the power is lower than 30%. 8V-48V voltage universal models: digital voltage display, can be universal 8V-48V range of batteries and batteries. The power display of the above models must be matched with the battery in order to feedback the correct percentage of power, thought the power is calculated according to the voltage. Output current two USB ports total 2A, now the big screen phone charging current are relatively large, it is recommended that if you are rushing the phone, only insert a single, otherwise it is easy to overcurrent damage.