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: 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. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!