Features: Mini size and easy to install, great working for control Voltage. It is suitable for 12V-24V. Mini size, easy to install, perfect for checking voltage. Mounted to the panel, nylon retaining nuts hold the gauge in place. Battery status between full charge and discharge The meter has easy-to-read LED segments and connects to your 12 volt system. Used to monitor battery voltage, with reverse connection protection, the line will not be burned. The battery voltage status can be grasped in time, and it can also be used for voltage measurement of other products. Specification: Input voltage:12V-24V Operating temperature:-40-- 80 Shell color:Black Aperture color:Red,Blue,Green Material:ABS Hole size:27mm/1.06inch Size:3.7cm/1.46inch x 3.6cm/1.42inch. Package Included: 1 x Car Digital Voltmeter NO Retail Box. Packed Safely in Bubble Bag.