Specification Brand : TwinPa BulletPoint1 : This product is for checking the status of the battery and the alternator. BulletPoint2 : 6 LED lights indicate Alternator and battery state, check before charge and overload display. BulletPoint3 : Small size and light weight, easy to carry. Dimension: 12 x 5.2 x 1.8 cm; Weight: 67g BulletPoint4 : Alternator state - accelerate the engine to 2000 rpm, when the green light is on, the charging status is ready. BulletPoint5 : Length of the wire: 27cm; Maximum voltage and current: 12V 15A Color : Green CustomerPackageType : Standard Packaging ExternallyAssignedProductIdentifier1 : 0613852331378 ExternallyAssignedProductIdentifier2 : 613852331378 ItemName : Car Battery Tester 12V Motorcycle Battery Load Analyzer Alternator with 6 LEDs Display Check Scan Tool for Audi/VW/Ford/GM/Chrysler/Benz/BMW/Porsche Car, SUV, Light Duty Vehicles ItemPackageDimensions_Height : 20.2 centimeters ItemPackageDimensions_Length : 2.8 centimeters ItemPackageDimensions_Width : 14.6 centimeters ItemTypeKeyword : torque-wrenches Manufacturer : NL International Co.,Limited Material : ABS PowerSourceType : Battery Powered ProductDescription : ONLY for 12 Voltage Battery Connect clamps with battery correctly, turn on engine, accelerate to 2000 rpm. These lights would indicate if alternator works well. If the Fault Light lit up when the alternator voltage is too high, it would hurt your battery. Turn off Engine These lights indicate if the battery is already fully charged. Check Before Charge This light indicates if the battery could be charged. When the voltage drops to 10V, the battery would be dead and can NOT be re-charged anmore.