Do you need a barcode scanner for your business?

When we owned a daycare we often talked about putting a barcode scanner or some other type recognition on the front door so that parents could get in the building without someone having to meet them at the door. 

And if we had looked online at posguys.com, we could have found exactly what we were looking for in the blink of an eye.  Tons of choices and the specs on the products are easy to decipher.