Features:
 

• Size:75mm x 40mm

• Power mode: cigarette lighter style

• Voltage measuring range: DC 8-30V ( DC 12V/24V Universal )

• Display: 3-bits, Red LED digital tube

• Voltage error: 0.1-0.2V

• USB Output Voltage: DC 5.0-5.1V

• USB Output Current: 0-2.1A

• Function 1: Battery voltage monitoring,for 12V cars, SUV, 24V trucks, buses.

• Function 2: USB charger, for the charger of 0-2.1A cell phones, digital cameras, tablet computers and etc.  

• Applicable Type: Support Apple/Android, suitable for IPhone/Ipad/Ipod/Samsung/GALAXY S4

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Please Note:  Not compatible with ALL Samsung GALAXY and Samsung table,but it can for most  Samsung phone or table.if you worry, please add a USB adapter for it .