The XX Eagle AXS Transmission Left Arm Spindle Power Meter utilizes our World stage proven XX crank arm with a subtly integrated power meter to record and deliver live, accurate power readings to your head unit. We achieve this by utilizing what we call “DUB-PWR” – a unique design that elegantly houses Quarq’s reliable and accurate power measurement inside the DUB crank spindle itself. Measuring left-side power to calculate total watts, it’s subtle, lightweight, compatible with any chainring setup, and boasts unbeatable battery life. It is also compatible with the Flight Attendant system, allowing for total connectivity between all AXS enabled components. No-compromise, no-fuss data delivery giving you an edge over the competition. FEATURES Innovative DUB-PWR design allows for lightweight, subtle Quarq power integration. Compatible with Flight Attendant Unique, groundbreaking design integrated with our medal-winning carbon crank design. +/- 3% accuracy Long battery life (400+hours) User replaceable AAA lithium battery Waterproof (IPX7 waterproof to 1 meter for 30 minutes) Right arm, Bottom bracket, Chainring and Spider not included SPECIFICATIONS Speeds: n/a Crank arm length: 165mm, 170mm, 175mm BB Compatibility: All SRAM Road WIDE DUB BBs, except Ai Chainring Size: n/a Bolt Circle Diameter (BCD): n/a Chainline: 55.0mm BB Spindle Interface: DUB Chainring material: n/a Guard: n/a Crank arm material: Carbon Color (Crank arm): Black Power Meter Type: Spindle Hub Spacing Compatibility: n/a