RCLITE 12V Universal Cigarette Lighter Socket Power LED Digital Voltmeter for Car Auto Motorcycle Boat Riding Mower Tractor Travel Trailer Caravan For your Motorbike Car/Boat/ATV/UTV/Camper/Caravans/ Travel Trailer etc Specifically designed for m Suitable for a variety of applications including: Marine cockpits, caravan applications,trucks,4x4s Display: 3-bits ,LED digital tube ,lamp display is blue,the state of your battery between full charg Can indicate a poor or bad charging system. Tells whether your battery is holding a charge or not The meter has easy to read LED segments and connect to your 12 volt system