I ordered the BarkOff "system" at supposedly buy one, get one free (just pay separate shipping). Buyer beware! When ordering on the website, it has a quantity button. When it says 1, it actually means you are getting 2 (the BOGO deal), if you don't realize that and you change the quantity, like I did, then you will actually order 4 barkoff's. Then it asks you if you want to upgrade to "platinum" with a "lifetime warranty" included for $10 more, then it asks if you want an AC adaptor for an additional $8 plu... read full review »