USB 3 is backwards compatible with USB 2. If your PC has a USB 2 and you are inserting a USB 2 product it will run at the slower USB 2 speed.

This printer is capable of MICR printing. However, Best Buy does not currently carry MICR toner cartridges for this printer.

If you want a wireless connection, I recommend a printer with built-in wireless. Consider one of the two models at the following link:

http://www.bestbuy.com/site/olspage.jsp?id=cat13504&type=page&pageIdentity=searchDriven&useProductString=true&productString=1218177897716*1218334222162&unProductString=1218177894799*1218024211404&catId=

No, this printer will only work with 110 volts.