Specifications:High quality shell, easy to stand alone or embed in the panel on the product.Black wire connect negative electrode, and red wire connect positive.Great accessory to display the battery capacity of your car.Type: Battery Capacity Tester IndicatorDisplay Mode: Battery + PercentageVoltage: 12VPower Supply: Lead-acid BatteryBattery Capacity Display Parameter:Battery Voltage >11.2V, 1 Grid LightBattery Voltage >12V, 2 Grids LightBattery Voltage >12.5V, 3 Grids LightBattery Voltage >13.3V, 4 Grids LightWhen battery voltage Size: 4.8cm x 2.9cm x 2.1cm/1.89" x 1.14" x 0.83" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Battery Capacity Tester Indicator