1. Working voltage: DC5V 2. Applicable batteries: All batteries that meet the stop discharge voltage of 2.5~3.5V and start from 2.8V to 4.2V when fully charged are suitable 3. Power supply interface: Type-C power supply interface (power supply and power cord are provided by yourself) 4. System language: Chinese, English 5. Number of tests: 2-channel charging and discharging measurements 6. Internal resistance measurement: Supported, the DC two-wire method is used to test the internal resistance. 7. Charging function: Supported, automatically cuts off charging when fully charged (lithium iron phosphate battery charging is not supported) 8. Discharge function: support, automatically stop when conditions are met, discharge current cannot be adjusted 9. Automatic charging and discharging: supported, the battery is fully charged when the automatic mode ends 10. Cycle charging and discharging: supported, adjustable from 1 to 9 cycles (only supported in automatic mode) 11. Status prompt: Supported 12. Cooling method: fan active cooling 13. Overheating protection: supported 14. Stop discharge voltage: 2.5V, 2.6V, 2.7V, 2.8V, 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, a total of 11 levels adjustable 15.Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use 16.Colour:As Shown 17.Material:PCB Package Contents: 1 x Internal Resistance Tester Module 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.