I'm so excited! I can actually answer a question for once instead of asking them! I use Niki plus and I like it a lot. The sensor was $19.99 or something like that. I bought the shoes at an outlet mall and they were around $44.00. You just have to make sure it is a "niki plus" shoe. There are many different types of shoes that go from reasonable to very expensive. When I work out I use a treadmill. I start the niki plus and than start the treadmill. I like it because it gives calories burned, distance etc. It also has a history. You have to calibrate it just like if you had a pedometer. Let me know if you have further questions. Nancy
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