POWERFUL: This is new and improved model. It is MORE POWERFUL than AA Battery-Operated callus shaver or scrubber. It is run by Nickel-metal-hydride Rechargeable Battery which can be charged for 1，000 times in its lifetime. Once the battery is fully charged， it can keep running for 40 min or you can simply "plug in and play". IF YOU PREFER TO APPLY EXTRA STRENGTH， LOOK NO FURTHER! It's even suitable for commercial use such as pedicure or spa.ECONOMICAL: Save money in batteries (NO AA batteries needed) and more Ego-Friendly. The savings in batteries add up over its lifetime.Durable: The roller is made of durable and top-notch quality mineral materials to last longer than other brands. It is detachable and easy to clean. Two ROLLER fit all your needs!Water-Proof: We use cutting edge technology to develop this seamless body making it easy to clean. It's rated IPX5 for water resistant making it safe to rinse under tape water， but do not immerse the device fully in water or take it in a shower.Hygienic and easily cleaned this product works best on dry skinFeatures: • It is operated by rechargeable battery making the roller spin with extra strength and powerful. The battery can be charged for over 1，000 times in its life. Once it is fully charged for 8 hours， it can keep running for 40 minutes or you may use the device while it is charging. You may enjoy the power and the convenience of portable. • It is even suitable for spa or nail salon uses but you may obtain the professional salon pedicure results at the convenience of your home. • Comes with two rollers: One is Coarse for hard skin and 2nd is spare roller. Two rollers fit all your needs! What is included in the package? It contains a callus remover， an adapter， An Extra Roller， a cleaning brush and a user manual. Result Guaranteed: Don't be fooled by so called "powerful" products if they are driven by two AA batteries. If you are tired of slow-running or constantly stopped device， you need to give this product a try RISK FREE. You won't be disappointed!