I originally purchased the portable SAESHIN Cordless B170 / H170 E-file nail drill machine. I thought about returning it for a Medicool…. THEN..I did something crazy and bought this strong 90. Wow, it is a plug-in and it is a beast. It’s heavy duty and it’s a beautiful piece of equipment. Go low go slow then build up. Quickly responds to whatever you need…smooth , it is old-fashioned buttons, black, and white on /off I would recommend either one of these drills or both One is a plug-in, which I think you need a back up and the other one is portable, which will take you a long way as long as it’s fully charged NMD Is an official supplier of Saeshin. (Per Saeshin) :)