Feature:1. It adopts vacuum cleaning system and highspeed centrifugal rotating dust collection.2. Its head can be detached and cleaned to better keep the body hygienic.3. The details of this product is trictly controlled to help you polish your skin comfortably.4. 1.5h fast charge, 50min long battery life, strong power, and more comfortable to use.5. The speed can be adjusted in two gears, which is suitable for different users.Specification:Item Type: Electric Foot GrinderBuiltIn Battery: Li Battery 950mAhCharging Time: DC 5VCharging Current: 2ARated Voltage: 3.7VRated Power: 2.5WUse Time: 50minSize: Approx. 10.5 x 6.6 x 5.4cm/4.1 x 2.6 x 2.1inLow Level Speed: About 1600 rpmHigh Level Speed: About 1700 rpmProduct Features: Safe foot protection, longlasting battery life, USB charging, exfoliating calluses, automatic absorption of dander, adjustable speed..Package List:1 x Host (With 1 Dark Sanding Head)1 x Gray Sanding Head1 x Blue Sanding Head1 x Filter Sponge Clamp Circle1 x USB Charging Cable1 x Manual1 x Cleaning BrushNote:1. Completely soak your feet first to soften the keratin: Soak your feet in warm water for about 10 minutes. If the calluses are thick, use 23 spoons of white vinegar + hot water to soak your feet. Keep your feet dry before using.2. Exfoliation should not be too frequent: use 12 times a week. It is not recommended to polish all dead skin calluses at once.3. Please completely charge it for the first use.4. The body is not waterproof and cannot be washed.