Features:
【DC 12V Motorcycle Voltmeter】LED Display, It is Perfect to Monitor the Condition of the Battery, You can Use It on Your Motorcycle, Car, Trailer, etc
【New Startup Mode Design】LED Display Occurs Self-test When Starting up, Similar to the Style of Car Instrument Startup
【Battery Voltage Monitor】The Voltmeter will Flash Constantly When the Voltage is Lower than 11.5V or Higher then 19.8V
【Easy to Install】Only Two Wires, The Red Connects to Positive and Black Connects to Negative
【Widely use】Perfect for cars, motorcycles, bikes, substation automation, distribution automation, test equipment, voltage regulator and so on.

Specification: 
Device Type: Car Digital Voltmeter            
Material: ABS            
Display Type: 3 Digital LED Display            
Display Color: Red/Blue/White            
Voltage Measuring Range: DC 5V-30V            
Input voltage: 12V            
Accuracy: -(0.2%), +(0.2%)            
Red Wire: Power Supply +            
Black Wire: Power Supply -            
Size: 2.16 in x 1.18 in x 0.59 in(5.5 cm x 3 cm x 1.5 cm)          

Package Included:
1 X Car Voltmeter
1 X Base
2 X Screws
2 X Zip Ties