Viper v2pro can determine whether it is fully charged by the color change of the LED light. When charging, Viper v2pro's LED light will show red, indicating that it is charging. When the charging is complete, the LED light will turn green, indicating that the charging has been completed. In addition, it is possible to charge by connecting a computer or an adapter, and check the power level after charging to ensure that the battery is fully charged. During charging and use, attention should also be paid to keeping the equipment clean and dry to extend its service life. In short, the Thunder Snake ViperV2Pro is a powerful, excellent mouse that is also easy and smart to charge and use.