The Stages Power Meter – Shimano Dura Ace Track 7710 is perfect for the enthusiastic cyclist, from those new to training using power to the seasoned professional looking for a simple, super light and inexpensive package. It is a replace left hand crank with 20g unit which houses an array of high technologies adapted from the rapid advancement in modern electronics. The accelerometer based cadence measurement is made possible thanks to technology developed for use in smart phones. Meaning there’s no need for magnets or zip ties on the bike. Stages Power meter’s uses bilingual communication between ANT+ and Bluetooth Smart protocols, the latter gives Stages the ability to ‘future proof’ this power meter by updating it’s firmware wirelessly using iPhone 4S or iPad 3 (or later) devices. This keeps the housing impenetrably sealed from the elements. By using Bluetooth Smart, it means that you can upload your ride directly from your iPhone to Strava or Training Peaks before your shoes and helmet are even off.