Perfect Compatibility: This charger dock is designed for Samsung Galaxy Watch 42mm/46mm SM-R800/R810/R815 only. (Note: Not compatible with Galaxy Watch 7/6/5/4/3/Active 2/Active.) Charging Instructions: Could not be used with fast charger adapter and make sure that the charging current is below 5V/1A. We Suggest to charge the dock through Computer USB Port. Power Protection Inside (PTC): Keep safe from over-current or over-charging for Samsung Galaxy Watch when connected the power source. If you plug the charger after blue and green light flashed, there is no smartwatch the light isn't on. Portable Design: Compact and lightweight design, convenient for travelers and business users. Make your smart watch charging become more convenient. Easy to Use: Easy to know the charging status with LED Indicator and the charger came with a USB Cable only for Galaxy Watch Smart Watch. Tips: 1.When using the device or charging in a high temperature environment, you may feel that the devic