2.4 GHz Wireless Computer with Altimiter See how far you've climbed and how hard you are working with the new NiteRider Rebel 5.0 computer. The new NiteRider Rebel 5.0 computer adds to the standard range of cycle computer features an accurate altimeter, so you can see how high you are climbing when you ascend that big hill. It also uses this altitude information, combined with your speed and rate of ascent, to work out how much power you are producing. If you fit the optional cadence kit to your Rebel 5.0, it will give you cadence information as well!