Features: Input voltage of DC12V, can be installed on motorcycles, for cars, ships use. The product comes with reverse connection for protection and short circuit for protection. Black for shell, coupled with exquisite workmanship, making the product look high-end atmosphere. The use of PC environmentally friendly flame retardant high temperature resistant material, high safety factor. Product design for color, when the product reaches a certain extent, show different colors, more intuitive to see the current battery status. Specifications: Material: ABS Size: Approx. 3.7x4.1 for cm/1.46x1.61 in Light Color: Color Input: DC12V Voltage Test Range: 5-15V (11.3V-11.9V red light; 12.0V-12.5V bright yellow light; 12.6V-15V bright green light) Waterproof Grade: IP65 Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Voltmeter 1x Threaded Retaining Ring 2x Sheath Terminal