80137 Hot Saling IP67 12/24V Digital Voltage Gauge Battery Monitor LED Display Voltmeter Car Boat brand new and high quality Features: Compact size with 3-digit LED display. Easy to identify battery status with LED. DC 12/24V automatic detection (compatible with two voltage systems). Completely sealed, no opening (IP67). Reverse polarity input protection. CE Certification. Waterproof grade: IP67 Battery lifespan indicator.(Green-full battery; Orange-half-full battery; Red-low battery) Specification: Rated voltage: 5-30V (12/24V automatic detection) Refresh rate: 10 milliseconds Shell material: Plastic Dimensions: 36.6x53mm/1.44x2.09inch Color: Black Quantity: 1 Set Package includes: 1 x Voltmeter 1 x Fixed Ring