Feautres:Reverse connection protection, and there are only two wires, easy to connect and use.LCD screen with blue / green / white backlight.Equipped with a PVC film, the surface is waterproof.Built with buckle, no screw mounting.When switched on, the percentage of power is displayed, and the remaining battery is displayed visually.Specification:Type: Battery Capacity Voltage MeterMaterial: HTN /-PCBWeight: approx. 13.7 g.Product size: 43.3*23.6mmOpen-Hole size: 40.8*20.8mmStandard voltage: 12-48 V.Area of application: battery or devices with battery.Working temperature: -10 - 50 C.Package contents:1 x battery capacity voltmeter.1 x cable.Note:1. Please allow for slight errors due to manual measurement.2. Different monitor colours may vary. Thank you for your understanding.