Some tips [SEP] I got  this thing when I was working retail, a lot of  long  shifts standing stock still  wih only a single 15 minute lunch break can kinda  kill your feet especially when you're heavy. I got  this thing to help me deal  with the calluses and just oiverall roughness of my feet. By itself it does a great job  but even using the black tip if you have feet like mine won't do you much  good  especially since that low grit means it tends to catch and stop itself due to thesafety feature built in to the device.<br /><br />So some tips I found are:<br />Use this once or twice a week. It feels like it's made for that especially with the high grit white tip  for fine filing and polishing<br /><br />Use with a cheap dust mask and away from electronics.  Trust me while most  dust is dead skin as it is, this thing doesn't so much grind away deadskin  and calluses as it vaporizes them. Nothing worse than having to  dust a computer or going to  check  your phone and just realise the horror you've created.<br /><br />Don't use pressure, the machine does the work for you and applying any pressure, especially witha  black tip, will just flat out stop  the machine.<br /><br />And lastly and probably the most important, NEVER STOP MOVING.  Even if it's a particurally rough spot  or  calluses, even if it's on low if  you leave it in the same place too long you will  give  yourself  a friction burn or, even worse,  take  of too much and leave your  foot raw. Instead  if  you want to  focus on the same  area  just rapidly tap the  machine aagainst the problem area giving it a second or  two  to  cool off in beteween. For the rest of the areas  making sweepng, brushing, or lazy cricular motions work the best