Features:LED Digital Display: Precise 3-bit LED digital display. Easy to read, real for time monitoring of battery voltage. Timely grasp the state of your battery voltage.Twist-and-Lock system. Mini size and easy to install, great for checking voltage. Used to monitor the storage-battery voltage, with reverse connection for protection.Adopt retaining nut to fix the voltmeter on the panel for closer connection. The words are etched- directly onto the product surface to ensure long-lasting durability.Waterproof design, mount in a panel with 1-1/8" hole, 0.25" thick, a nylon retaining nut holds the meter in place.Fits most for DC 12V Motorbike Car, Boat, ATV, UTV, for Camper, Caravans, Travel Trailer etc. Specifications:Material:PCDimensions: 37x27mm/1.45x1.06inchColor: BalckInput voltage: 12 (V)Output voltage: 5 (V)Output current: 1000 (mA)Working temperature: -40-80 ()Applicable charging range: voltage power detection 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. Package includes:1pc LED Digital Voltmeter