1、Display voltage, current and mAH data simultaneously, convenient to check. 2、Multi - group detection data saving, power - off saving function. 3、USB male head and MicroUSB port are used to double charge. You can detect the quality of MicroUSB line. 4、The current sample is 25 milliohm and the loss is smaller. 5、With precision current calibration function, the current accuracy is higher (It has been calibrated when shipping). Features: 1. Display voltage, current and mAH data simultaneously, convenient to check. 2. Mobile power output mAH can be detected. 3. Multi - group detection data saving, power - off saving function. 4. Does not affect data transmission. 5. Higher precision, current parameters will not jump. 6. USB male head and MicroUSB port are used to double charge. You can detect the quality of MicroUSB line. 7. The current sample is 25 milliohm and the loss is smaller. 8. With precision current calibration function, the current accuracy is higher (It has been calibrated when shipping). Specifications: Material: ABS Color: White Input voltage: 3V - 7V 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 euro Test content: battery voltage, current, discharge capacity (10 sets of data in total) Size: Approx. 6 * 2.8 * 1.5 cm / 2.4 * 1.1 * 0.6 in Total length: Approx. 25 cm / 9.8 in Weight: 30 g Package Include: 1 x USB Power Tester 1 x Instruction Book