Features:Reverse connection protection, and there is only two wires, easy to connect and use.LCD screen with blue/green/white backlit.Equipped with a PVC film, the surface is waterproof.Built with buckle, free of screw installation.Power-on shows the percentage of power, visually showing the remaining battery.Specification:Type: Battery Capacity Voltage MeterMaterial: HTN / PCBWeight: Approx. 13.7gSize: Approx. 4.3 * 2.3 * 1.4cmStandard voltage: 12-48VScope of application: battery or devices with batteryWorking temperature: -10 -50Charging time: depends on matching batteryPackage list:1 * Battery Capacity Voltage Meter1 * CableNote:1. Please allow slight error due to manual measurement.2. Different monitor colors may be different. Thanks for your kind understanding..