According to the company this is the WORLD’S FIRST USB rechargeable Foot Callus remover that is safe on the environment and delivers powerful and efficient exfoliation. This remover is waterproof, lightweight and comes with a 30 day money back guarantee. The package includes the rechargeable callus remover with grinding head, an extra grinding head both in lime green, a soft cleaning brush, a usb charging cable and a user manual. It is very power efficient and the motor gently removes dead skin from tough, hard, cracked feet. This USB Callus Remover only requires a quick charge from your laptop, desktop, or any other device that has a USB input. It really only took about 30 minutes and the charge light was off and the remover was ready to use. This worked great on the rough patches on my heels. My skin is so much smoother and soft. Great product with real results. I received this product for free in exchange for my complete and honest review.