The Garmin Rally RS/XC210 power meter is a precise bicycle component designed for accurate power measurement during road and off-road cycling. This dual-sided power measurement system independently measures power output for the left and right pedals, providing comprehensive data on total power, left-right balance, and pedal smoothness. It features a robust aluminum construction with a stainless steel axle, ensuring durability and reliable performance in various weather conditions. The power meter is compatible with Look-Keo cleat systems and offers easy installation without the need for special tools. It measures power with an accuracy of plus/minus 1 percent and includes temperature compensation for consistent readings across different environmental conditions. The device has a battery life of approximately 120 hours and uses a user-replaceable CR2032 coin cell. It supports ANT+ and Bluetooth Smart connections for pairing with compatible bike computers, smartphones, and fitness apps. The power meter weighs 316 grams per pair and has dimensions of 120 mm in length, 80 mm in width, and 40 mm in height per pedal. It is designed for use with road bikes, gravel bikes, and cyclocross bikes, providing cyclists with detailed performance data to optimize training and performance. The successor to previous Garmin power meters includes improved battery life and expanded connectivity options. The power meter automatically calibrates and features zero-point adjustment for long-term accuracy maintenance. It is suitable for cyclists seeking precise power measurement for training analysis and performance tracking.