Easy to identify battery status LED 12 / 24V system automatic detection (compatible with two systems)3 LED panel digital display, reading in seconds, more intuitive, quick and convenient. Mini size, easy to carry, save the space and wont hinder driving, guarantee your safe driving. Easy to install with necessary fittings, hold the meter in place, fix tightly and not easy to move, great for checking voltage. Made of premium quality material, flame retardant and environment-friendly, safe and durable. When the 12V mode voltage is lower than 11V or the 24V mode voltage is lower than 22V, the reverse polarity input protection self supply measurement DC voltage low-voltage alarm. Specification: Working Voltage: 12/24V Opening size: 28mm Display: LED Material: ABS Voltage level: 7-30V Fitment: Trucks, RV, coach, boats, motorcycles, etc Item Size: 36.6 x 49.6MM / 1.44 x 1.95in Item Weight: 24g / 0.85oz Package Size: 16 x 12 x 3CM / 6.30 x 4.72 x 1.18in Package Weight: 31g / 1.09oz Package List: 1 x Digital Voltage Meter 2 x Insulated Terminals Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.