Note: 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 2?3 spoons of white vinegar + hot water to soak your feet. Keep your feet dry before using._x000D_2. Exfoliation should not be too frequent: use 1?2 times a week. It is not recommended to polish all dead skin calluses at once._x000D_3. Please completely charge it for the first use._x000D_4. The body is not waterproof and cannot be washed. specification: Condition:Brand New _x000D_Item Type: Electric Foot Grinder_x000D_Built?In Battery: Lithium Battery 950mAh_x000D_Charging Time: DC 5V_x000D_Charging Current: 2A_x000D_Rated Voltage: 3.7V_x000D_Rated Power: 2.5W_x000D_Use Time: 50min_x000D_Size: Approx. 10.5 x 6.6 x 5.4mm/0.4 x 0.3 x 0.2in_x000D_Low Level Speed: About 1600 rpm_x000D_High Level Speed: About 1700 rpm_x000D_Product Features: Safe foot protection, long?lasting battery life, USB charging, exfoliating calluses, automatic absorption of dander, adjustable speed. Features: 1It adopts vacuum cleaning system and high?speed centrifugal rotating dust collection. 2Its head can be detached and cleaned to better keep the body hygienic. 3The details of this product is trictly controlled to help you polish your skin comfortably. 41.5h fast charge, 50min long battery life, strong power, and more comfortable to use. 5The speed can be adjusted in two gears, which is suitable for different users. PackageList: 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 Brush