I've been using Runmeter and Cyclemeter for over a year now, and am thrilled to have this great HR monitor to use with my iPhone 4s. Low energy bluetooth means no dongle in the iPhone, and the battery should last a year. I've only had for about 6 weeks, but the battery's still going great. Worked perfectly out of the box - didn't bother to read the instructions. Just put it on, turned on my fitness app, and was good to go. HR appears accurate. The band itself is waterproof, however bluetooth signals can't travel through water, so it's not much use swimming, but certainly it's fine getting sweat/rain on it. And since I don't have to use a dongle (like with any other non-bluetooth monitor) I can fit my iPhone into its waterproof case.
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