Specifications: --Working power: DC5V external power supply or 18650 battery (both need to provide their own) --Applicable battery: meet the stop discharge voltage 2.5 ~ 3.5V, 4.2V charging battery are applicable --Power supply interface: Type-C interface, power supply cable provided (C-port phone cable) --System language: English / Chinese switchable --Test quantity: 1-channel charging and discharging measurement (right side battery only) --Internal resistance measurement: support, using the DC two-wire method to test the internal resistance --Charging function: support, 1-channel program control maximum about 1A charging; 1-channel hardware control maximum about 0.5A charging --Discharge function: Support, only 1 channel supports maximum discharge of about 1A, automatically stop when conditions are reached --Automatic charging and discharging: support, the battery is fully charged at the end of automatic mode (stop voltage is set at 2.8V or above) --Cyclic charging and discharging: Support, 1~9 times cycle adjustable --Status indication: Support --Stop discharge voltage: 2.5V, 2.6V, 2.7V, 2.8V, 2.9V, 3.0V, 3.1V, 3.2V, 3.4V,3.3V, 3.4V, 3.5V total of 11 grades adjustable --Discharge current: two-way resistance, maximum of about 1A current, not adjustable, does not support independent transformation --Charging voltage: special battery charging chip control, maximum about 0.5A/1A charging, full charge voltage 4.2V --Power failure save: only save the setting parameters, not save the measurement dataFeatures: --The product supports single channel internal resistance and capacity measurement --Support individual charging and up to 9 charging and discharging cycles in automatic mode --Use DC two-wire method to test internal resistance, switchable between Chinese and English --18650 battery holder using compact battery holder, suitable for flat battery measurement --Maximum charge/discharge flow is about 1A Note: The charging and discharging process will generate local high temperature, please ensure that the use of the environment is open and uncovered, if you can increase the fan cooling is better. In order to ensure that the battery clamps firmly, 18650 battery holder using compact battery holder for flat battery measurement! Does not support the charging of lithium iron phosphate batteries. Chinese and English switching method: Before powering on, long press the second button from left to right and then go to power on to switch between Chinese and English Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.