Wide Compatibility: Supports 4 20V voltages and 0 3A current detections, suitable for phones, tablets,, car chargers, and other USB powered devices for versatile testing Multi Parameter: Accurately displays voltages, current, charging capacity, and working time with 0.01V / 0.01A resolution and ±1% precisions, providing real time into device power consumption Compact & Portable: Lightweight and plugs and play design ( 59×23×13.5mm) requires not external power, ideal for on the go testing or lab diagnostics Safe & Clear Design: Clear ABS housing with LED display ensures readability, while built in low resistance circuitry ( 0.1Ω) minimizes measurement errors and protects devices User Friendly Operations: Features a RESET button for quick data clearing and auto saves capacity / timing data after power off, ensuring seamless continuous testing, Manufacturer: Obotsnoi