Features:1. Using high-quality materials, the quality is guaranteed2. Input USB can be inserted on both sides3. Precise measurement4. Delicate and sizeSpecifications:Voltage: 4-30VCurrent: 0-5AGrouping: 1-9 groupsTime: 0-99 hoursTemperature: -5~80Power: 0-150WWatt-hour: 0-99999WhmAh: 0-99999mAhInstructions:Click the button to the saved group data (Time, Wh, mAh). Long press the button for 3 seconds to clear the current single group of saved data (Time, Wh, mAh)Color:BlackMaterial: plastic+metalPackage Contents:1 x USB current and voltage testerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.