Instructions for use: Please simply place the device on your affected nail and long press the power switch, then the light starts to flash, the blue light and the invisible super pulse light work at the same time. This device turns off automatically after 7 minutes of treatment. Please use this device daily and at least once a day. Rechargeable and battery efficiency: a USB cable is included, once fully charged, it can last for days. No battery required. Practical & portable: super light and compact, fits comfortably on fingers and toes of all sizes. It is easy to carry and can be used anytime and anywhere. Effective & Scientific With a simple session of just 7 minutes a day, you can see a great result within a few weeks. It is healthy and re, and after treatment, no complicated procedure is required. Safe and re KTS nail treatment device with highly effective and natural light therapy function is painless, without risk and side effects. The 470nm blue light can kill the bacteria, keep the nail clean, while the 905nm super pulsed invisible light interact with the iron ion in the haemoglobe and enrich the affected area with oxygen to achieve the treatment effect.