Cannot recommend and would not order again except for the price.

Since I have had similar products for years, I did not have trouble figuring out what to do but there were no markings or instructions or any way to tell how to place the batteries. I had to try every possible combination and finally got it right. Usually there is a + or a - sign to show you how the batteries go in. There was no such thing in this model. However, it was so much cheaper than I am used to paying of an oximeter that I would probably buy again, unless it quits on me soon.

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