How do the 2 speeds compare?
The 2 speeds are better because you have a slower speed in case your foot is sore or you have an injury.
The second speed is obviously faster, quicker time to complete the task.
What type of batteries does it take
This item has a 600 AH Lithium Battery ( as stated on the front of the box)> It comes with a charger, you do NOT add batteries merchants make an informed decision about your product or collection. This section will appear across all products.
Does it remove corns?
Yes, if you do a lot of walking/running and have very stubborn calluses, then it works well on all trouble spots!