Description No need for professional wiring, easy to use, just insert in the USB port, discharge and charge, you can detect the working current and voltage of the device, and count the battery capacity. It can detect the charging capacity of the battery of the tablet and mobile phone, and judge how much the battery performance drops, and whether it needs to be replaced. It can detect the discharge capacity of the charging treasure and calculate the conversion rate of the charging treasure. It can detect the charging current of your digital device, the working current of 5V router and any other 5V USB port device (such as USB light). Small in size and light in weight,easy and convenient to carry or store. Specifications: Input voltage: 3V-15V Voltage resolution: 0.01V Test current: 0.05A-3.50A Current resolution: 0.01A Capacity range: 0-19999mAH Accuracy: plus or minus 1% Line loss: about 0.1 ohm Test content: battery voltage, current, discharge capacity (a total of 10 sets of data) Size: as shown Color: white/black. Note: There may be little color differences depending on the resolution. There maybe a slight error due to different measurements. Packing including: 1* USB detector.