Features Scope of Application: This battery capacity tester is mainly used for test the capacity of 18650 battery, check for better using experience! LCD Display: The 1.77in screen displays internal resistance, capacity, voltage, current, power and other information at the same time. Modes Adjustable: Preset automatic and charging and discharging modes, and select corresponding modes after starting. Data Reset: The power off, mode switch will make the data capacity, energy and time data automatically reset. Working Instructions: Some components will produce local high temperature during charging and discharging during use. Please ensure that the use environment is open and free of cover. It is better to increase fan heat dissipation. Specification: Item Type: Battery Internal Resistance Tester Material: PCB Screen Size: Approx. 1.77in / 4.5cm Working Power Supply: DC5V power supply or 18650 battery x 2 (shipped without battery) Applicable Battery: Suitable for all batteries that meet the requirements of stopping discharge voltage of 2.5-3.5V and starting from 2.8V to 4.2V Power Supply Interface: Type C interface, power supply line self prepared (C port mobile phone line) System Language: Chinese (default), English Test Quantity: 1 way charging and discharging measurement (only right battery position) Internal Resistance Measurement: Support, use DC two wire method to test internal resistance Charging Function: Support, automatic cut off charging when fully charged (lithium iron phosphate battery charging is not supported) Discharge Function: Support, automatically stop when conditions are met, and the discharge current is not adjustable Automatic Charging and Discharging: Support. The battery is fully charged at the end of automatic mode Cyclic Charging and Discharging: Support, 1 to 9 cycles adjustable (only supported in automatic mode) Status Prompt: Support 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, 11 adjustable gears Package List:1 x Battery Internal Resistance Tester Package List 1 x Battery Internal Resistance Tester