![]() ![]() The two are connected via button snaps, which is quite clever. The unit is comprised of an adjustable black strap, and the sensor unit itself, which looks like a flat, slightly oval pebble…the kind of shape you’d normally flat-toss into a pond to see how many skips you can get out of it before it sinks. On paper, at least, this heart rate strap will do the job whichever type of device is on the other end. ANT+, however, is more focused towards fitness tech equipment and cycling gear, and is the preferred protocol for many cycling computers. Bluetooth is by far the more popular short-range device communications protocol among consumer electronics, having started with cellphones and continuing its influence to this day. Stages is known more for its crank-arm-based power meters, but it also makes a heart rate monitor that is capable of communicating via either Bluetooth 4.0 Low Energy or ANT+. To hit two birds with one stone, as the Padrone Digital does accept a Bluetooth-based heart rate monitor strap, I went with Stages Cycling’s unit. ![]() If you’re serious about your training, and want as accurate a tracking of heart rate as possible for, say, hitting your training zones, the Charge 2 will tend to have a bit of undesirable lag and/or variance. While the Charge 2 generally works all right for most people and when subjected to casual, everyday use, Fitbit’s LED-based photoplethysmography technology isn’t the snappiest or the most responsive for heart rate tracking, especially under the demands of aerobic exercise such as cycling. I didn’t have a dedicated Bluetooth heart rate strap at the time, and so kept relying on the Fitbit Charge 2 for heart rate monitoring. Back when I got the Cat Eye Padrone Digital cyclocomputer, its bundle comprised of the display unit and the ISC-12 Bluetooth speed and cadence sensor.
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