I have used this with my Garmin Forerunner 305, Forerunner 50, and Forerunner 405cx. Just wet it with saliva or water before you start, and it accurately and easily tracks your heart rate. The strap that attaches it to your chest is easily adjustable and easily removable. Unlike other products, my heart rate does not “jump around” 10 or 20 beats. The battery lasts a good amount of time and is easily replaceable. This is the best heart rate monitor that I have used, and I prefer it to Polar.

Works as advertised, no problems. This is a replacement of my first one that the seal (o-ring type) in the battery compartment failed, causing the battery to corrode due to moisture leaking. Then it never worked again. Be careful changing batteries not to damage the seal.

(Please note: the other user’s negative review for this item is not accurate. The photo pictured is accurate for the Premium HRM, Product Number 010-10997-02. See below for update to original review.)

ORIGINAL REVIEW:
I tested out my friend’s Premium Heart Rate Monitor (HRM) on the trail this weekend and was extremely impressed and ordered mine yesterday. (My hat is off to Amazon – this is a better deal than dealer’s pricing.)

The premium HRM is an excellent accessory to my Forerunner 405, which I initially purchased without a HRM, and the additional data set will be a big help to me when charting my progress and seeing gains over the same terrain over time, not to mention a decent “zone” training aid when road cycling.

A VERY IMPORTANT ITEM OF NOTE that people tend to forget/ignore when using these HRMs is that you need to wet the contacts for an accurate reading. You can use water, or simply rub some spit on in a pinch, but I would recommend swinging by a running store and getting a bottle of gel – it’s cheap and it lasts forever, plus in my experience it provides the most accurate data… which is what we’re interested in with these toys, right? 🙂

Enjoy! I know I will – happy trails.
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UPDATE, Feb. 11th: Just a brief follow-on update from my original pre-review.

After three runs, this HRM functions beautifully. I have zero data spikes, my 405 picks up the signal immediately, and I haven’t even had to use my runner’s electrode gel for the contacts; just wet the contacts in the sink and strap it on and go. Simply put, it works PERFECTLY.

It’s also great having the training data to see which zone I’m training in or “Why did that run suck so hard?!”… oh, my hr was sky-rocketing and I was pushing too hard for event ‘x’.

I would post an image here if I could so you could see the solid data and corresponding Garmin Connect screen capture.

Solid product, five stars.