Features:
Size:75mm x 40mm
Power mode: cigarette lighter style
Voltage measuring range: DC 8-40V (DC12V/24V Universal)
Display: 3 bits, Red LED digital tube (if need Blue LED,please check the item B00EZ031KC)
Voltage error: 0.1-0.2V
USB Output Voltage: DC 5.0-5.1V
USB Output Current: 0-2.1A
Function 1: Car 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

Please Note: May not compatible with some Samsung tablets, you can use a Samsung adapter.

Package Includes:
1x 2in1 Digital Voltmeter and USB Charger

• USB output 5 0-5 1V regulated Voltage, current 0-2 1A

• Keeps informed of battery and charging Voltage at all times and can charge some other device at the same time

• Great tool for monitoring the health of your electrical system, small design and doesn't take up much room and very light weight

• You can leave it plugged in 24/7 it wouldn't use enough power to drain your battery

• Quick and easy to use to check Voltage of your car/boat/truck or whatever just plug it in and watch the Voltage and see what your alternator is actually putting out very easy to read and see