we have jim mcdaniel. thanks for coming on the show tonight. bought these things for myself, for other people. how accurate, i know you test this stuff, how accurate are these things? >> to be quite honest, they're not perfectly accurate when it comes to measuring steps. they can give people a general overall view of their health and some activity information but they're not precise medical instruments by any stretch of the imagination. gerri: not precise medical instruments and there's all kind of brand names out there. nike has its own product. we've seen the up, all kind of different products. what are these bands good at and what are they bad at? >> i think they're good because they give you a physical reminder you should be more healthy. obviously they can give you alerts and some other notifications to let you know, when you're been sedentary for a period of time or days that you should be getting out for more activity like running or walking but they give that general information. where they kind of fall short is, some of the claims they