【Multi-functional Electric Brush & Multi-Purpose】This hair brush has four modes: EMS mode (single), LED mode, vibration mode, and EMS + LED + vibration mode. Each mode also has three settings. You can freely select the mode according to your preference. Power button (LED light adjustment): Long press to turn the brush on/off, short press to switch the light between red/blue/purple/off. The middle button is the EMS button: Short press to adjust the EMS level or turn it off. Three levels can be set. The bottom button is the vibration level adjustment button: Short press to adjust the vibration strength or turn it off. 【Use with Serum】The brush head with a removable box can be used in conjunction with serum. Compared to traditional manual application, the smooth roller applies evenly with overwhelming penetration. With a large capacity of 8ml, frequent refills are unnecessary. 【Compact and Convenient & Operating Time/Charging Time】This product is ultra-lightweight and has a round design that fits perfectly on the scalp and facial lines, providing a comfortable user experience. Cordless and easy to carry, it can be used continuously for up to 3 hours with a charge of about 3 hours. In addition, it automatically turns off if left unattended for 15 minutes, making it safe to use, and the flat bottom design allows it to stand on a desk for convenient storage.