Very nice video demo, explained how easy it is to use. I thought these would be hard to use since a friend of mine owns another brand and she was complaning how difficult it was to operate but this video shows just how simple it is. Now she is getting the same one after using mine and she also said hers needs calibration and this does not I had no idea what that was. I found out that this sensor can be replaced and the other breathalyzers have to be sent in. I watched the other video after she mentioned it, I didnt see the other when I orderd it but now I see it. so it is even better than I thought yes, I would recommend.