I would have to say that this was a wise purchase. To me it is worth every dime...and more!
This very thing kept me from opening the door and being surprised by whom I didn't want to see; unexpected visit.
I continued to enjoy my Tostados and salsa sauce(and doing my salsa dance, hahaha). This thing works! So easy to set up a 13 year old can do it. http://www.ebay.com/sch/elmadavid/m.html