This is a used unit that is about 1.5 years old. It comes with everything needed to mount to your bike, including cadence and speed sensors and magnets, and obviously the computer. The sensor is wireless and is powered by a cheap and readily available CR2032 battery. It also comes with a very lighted used heart rate monitor. Here is more info:
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The package cost me around $130. I'm asking $50 for everything. Let me know if you're interested.
For anyone looking for CR2032 batteries, Amazon has a great price on a great brand: