total waste of money [SEP] i am really not understanding the good reviews on this product it just does not make sense to me this thing has no power at all it might be different if it was variable power and this was the low setting but it just bogs down completely the minute it touches your nail or tough skin the attachments really are lame too they each are supposed to have a different purpose but each one performs about the same it is battery operated or ac plug in the battery power you might as well forget but the plug in which i used again just not enough power it does come with batteries switching out the attachment heads is very easy they just push in and pull out one drawback to the electrical plug in option is that the cord on the main unit is coiled and quite short when i plugged it in to the extension cord next to my bed i had to put the plug in part up on the bed to have enough leeway to use the unit very stiff coilit has a few attachments for acriylic nails which i would not use anyway not worth the money in any way