Place the unit where you want to use it, push a button to turn it on, load the treat compartment, close the door, and you're ready for action. The dog will not be able to remove the treat until you activate the remote to open the door to the treat compartment.
http://www.cleanrun.com/index.cfm?fuseaction=product.display&Product_ID=2139&ParentCat=675
Yeah, Lucy had the door ripped open in 3 minutes.
Any better/sturdier options out there?