Features: With only two wires, wiring is simple. Can be used for DC power in the 8-40V voltage range or 12V, 24V battery. Two USB ports can output 5V2A (max) automatic distribution output current. It adopts universal size design, and the square hole can be directly snap-installed, which is highly versatile. It has voltage display function, and USB output (mobile phones charging) function. LED display, motorcycle voltmeter is very suitable for monitoring battery status. You can use it on your motorcycles, for cars, trailers, etc. The large screen is clearly visible. It can be used during the day, rain and night. The LED display screen performs self-checking when starting, which is similar to the start-up style of a car instrument. Voltmeters are widely used in automobiles, motorcycles, bicycles, substation automation, power distribution automation, test equipment, voltage regulators, etc. Choose appropriate installation methods according to different situations to achieve the best results. Specifications: Material:ABS Size:Approx.4.8x2.9x1.6cm/1.88x1.14x0.62inch Color:Green/Blue/Red Dimensions: length 48 x width 29 x thickness 16mm Hole size 46×27mm Display resolution (DC8-40V) is 0.01V when it is less than 10V, and 0.1V when it is greater than 10V Accuracy is about 1% Display mode: three-digit 0.36" LED digital tube Lead length 20cm Display color red emerald green blue optional The refresh rate is about 200mS/for time USB output 5V2A (maximum current 2A, automatic distribution of two USB Power supply without power supply Input 8-40V (can be used for 12V, 24V battery Working temperature -10°C~65°C Package Includes: 1x Voltmeter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.