Red wire positive; black wire negative. IPX7 waterproof with a fully enclosed shell, allowing use in outdoor humid environments. Compatibility and use cases Works with motorcycles, twowheel electric vehicles, threewheel electric vehicles, cars, and supercars; as long as the vehicle is equipped with a battery, it can measure the percentage of residual voltage. Digital battery monitor for versatile battery systems and chemistries, providing clear visibility into remaining voltage. Voltage and battery compatibility Suitable for 7100V systems (examples include 12V, 24V, 36V, 48V, 60V, 72V, 84V). Supports LiFeO4 battery, lead acid battery, ternary lithium ion battery, NiMH battery, and 18650 power battery. Key benefits Easy monitoring of remaining battery voltage percentage to plan charging and prevent unexpected power loss. Broad compatibility across vehicle types and battery chemistries, reducing the need for multiple monitors. Robust construction with IPX7 protection for reliable operation in challenging outdoor conditions. Use scenarios Daily motorcycle or scooter rider: monitor residual voltage to avoid getting stranded and schedule charging before the battery depletes. Outdooruse EVs (twowheel or threewheel) in humid environments: IPX7 waterproof design ensures reliable monitoring regardless of weather. Car or supercar owner with multiple battery types: track voltage percentage across LiFeO4, lead acid, ternary Liion, NiMH, and 18650 power batteries to manage maintenance and charging.