be sure that it contains a dremel
also you dont necasseraly have to go for the brand, dremel is a BRAND of ROTARY TOOLS or HANDHELD ENGRAVERS so ask about them rather then just for a dremel, you can get cheap ass ones for like 20 bucks with 50 interchangable bits, my first one was an Altools Rotary which worked well but i upgraded to a dremel brand one that costed a lot more but was worth every cent in terms of reliability and power