Usage Tips:Advanced Monitoring: This Hall Bluetooth voltage and current meter features a 2.4-inch color screen for clear and accurate readings of your electric car or RV's battery status More Accurate Measurement: With charging overvoltage, discharging undervoltage, charging overcurrent, discharging overcurrent protection, with buzzer alarm prompt function Bluetooth Connectivity: Easily monitor battery performance remotely via Bluetooth, ensuring you always have real-time data at your fingertips Wide Application: This meter is suitable for a variety of electric vehicles and RVs, helping to effectively manage battery capacity and lifespan Reliable Battery Management: Accurately tracks voltage, current, and battery capacity to help prevent overcharging and battery damage Current: 0A~50A Voltage: 0.01V~120V Measurement range when powered by itself: 8V~120V Measurement range when powered externally: 0~120V Capacity: 0.000AH~99999.9AH Energy: 000.00KWH~5999.9KWH Power value 000.0~999KW Display mode: 2.4-inch color LCD display Wireless communication distance: 10 meters for a single group in open space Measurement rate: 20 times/second Colour: As Shown Material: PVC Package Contents: 1 x Coulomb Meter Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.