Here are the optical sensors that measure the heart rate. I use it all day and have it connected to my phone constantly. Now, I don't know how long that low battery lasts. I'm looking at 4 days and getting the low battery warning.
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The battery life is supposed to last 5 days due to the drain from constant heart rate measurements. It clips on to the watch behind the face and band. Garmin advises to limit how often you press the physical button underwater. I have tested it down to 12 ft and it did just fine. The device is waterproof to 5 atm or 50 meters. On the side of the screen there is one physical button that allows you to access the menu, and certain other features. I would like to get a screen protector for the device eventually. I am a little worried that the screen may scratch easy. (works with gloves, but also in the shower the water will change screens and turn on the back). It is a touchscreen, it will react to anything touching it. (the light can be turned to automatic, everythime you raise your arm, or only on touch). There is a soft back light that allows it to be read in low light conditions. Their price: Comparable to that of fitbit charge hr. Not to be discouraged I did some digging and found that Best Buy has rights to sell them until January 2016. As of this post the price on Amazon is gone and it says currently unavailable. Now don't have a heart attack! I did not pay that for this gem. So I just happened to be perusing Amazon when I stumbled across the vivosmart hr. Truthfully because I'm not a fan of constantly taking watches on and off. And I was on the fence, looking for a watch that was waterproof. She decided to roll with the fitbit charge HR.
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My wife and I decided we would give wearable fitness a try. I just recently purchased the Garmin Vivosmart HR wearable fitness watch earlier on November 10.