Features： 1、Efficient Grinding: Electric foot callus remover uses quartz stone as sand head, durable and efficient grinding , non irritating, can be gentle exfoliation. 2、Smart Safety Lock: Washable foot grinder has a built in smart safety lock that locks immediately to protect your foot skin, once the force is too strong. 3、Large Capacity Battery: Electric foot grinder has built in 1200mAh lithium battery, standby up to 3h large capacity, therefore it is able to be used for a long time. 4、Appearance Design: Rechargeable callous remover has a soft curved surface, light body, has more comfortable hand feeling and it is easier to use. 5、Display Design: Electric foot grinder has an ultra clear smart screen display, therefore there is no need to worry about suddenly power is exhausted. Specification： Item Type: Washable foot grinder Material: ABS Battery Capacity: 1200mAh Battery Type: Lithium ion battery (built in) Package List： 1 x Washable Foot Grinder 2 x Replacement Heads 1 x Cleaning Brush 1 x USB Charging Cable 1 x Instruction