CatEye - 4iiii Precision Power Meter, Ultegra 6800 Crankarm, 172.5mm
PRO-LEVEL ACCURACY: Our 4iiii power meters are the most accurate power meters in the world, providing data accurate within a 1% error margin.
GO THE DISTANCE: The 4iiii won't stop until you do, providing over 100 hours of battery life.
SIMPLE AND MODERN: Your CatEye computer is compatible with ANT+ and Bluetooth head units, smartphones, and 4iiii products. Use the 4iiii app for hassle-free set up and updates.
LIGHTWEIGHT: The 4iiii's compact design weighs in at only 9 grams, making it the lightest power meter available.
ADVANCED TECHNOLOGY: The 4iiii power meter is capable of measuring tri-axial strain on your crank.
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Details: A joint venture between CatEye and 4iiii Innovations. The CatEye/4iiii PRECISION power meter helps you train harder and smarter. 100+ hours of battery life. Weighs only 9g.