MULTI-CERTIFICATIONS: All the materials of the foot file kit are friendly and meet 100% natural standards, paraben free and unleaded, Conforming to FCC standard, and the battery meets the UN38.3 standard, If you have any questions, please feel free contact us through platform and we will reply within 24h. RECHARGEABLE:The high-efficiency foot pedicure tool built in 1300mAh rechargeable battery, which can charged through MICRO USB for 4-5 hours and can work for 1-2 hours. COMFORTABLE USE:The ergonomically designed foot scrubber with handle feels comfortable in your hand, care your delicate heels and beautiful feet without the need for a foot spa, ideal for men and women seeking safe professional removal of dead skin at home. EASY USE :Press the roller latch on the Electric Callus Remover for Feet of side easily replace different roller,Press the POWER button for more than 2 seconds to work,and Press the +/- or POWER button to change 3 speeds. POWERFUL & 3 SPEEDS: Foot scrubber with 1700 rpm, 2000 rpm and 2500 rpm, high speed with coarse rollers to remove coarse calluses, medium speed with normal rollers to remove dead skin, low speed with normal rollers for fine repair , intelligent automatic protection design, if the pressure is too high, it will automatically protect and stop to avoid damaging the skin.