【Treatment Penetration Accelerator】 (Quoted from the official website) Penetrates the beauty ingredients of treatments deep into the hair with 1.1 million ultrasonic vibrations per second. Achieve a salon-quality finish at home. Blue LED supports penetration into the hair. Simultaneously corrects cuticles, leading to shiny hair all the way to the ends. Waterproof (IPX5) and cordless, so it's okay to use in the bath. Using your usual treatment products, you can achieve salon-quality home care at home. Purchased through Medulla's official subscription. Brand new, unused, and unopened. The delivered box will be wrapped in double-layered bubble wrap and packed with cushioning material.