SRAM XX/XX SL Eagle T-Type AXS Power Meter Spider The XX SL Eagle AXS Transmission Power Meter records and delivers live, accurate power readings to your head unit. Utilizing an all-new spider-based design, this is SRAM's most accurate, high performing power meter. The spider design uses a proprietary thread-on chainring mount system which has allows reduced weight without compromising reliability. A dual sided power measurement system calculates total watts, it's subtle, lightweight, 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, high-performance data delivery giving you an edge over the competition. Features Specifically designed for use with XX SL Eagle T-Type Thread Mount chainrings (Sold separately)Magic Zero - automatically checks and recalibrates your power meter as you ride Bluetooth low energy technology and ANT+ wireless data transfer Ax Cad - no cadence magnet required Power readings are accurate within +/-1. 5% and aren't affected by climate conditions during a ride AXS(TM) enabled for easy monitoring and firmware upgrades Compatible with all Eagle Transmission 8-Bolt cranks Waterproof (IPX7 waterproof to 1 meter for 30 minutes)Uses a common CR2032 battery that last for 200 riding hours and changes without tools | Sram | Xx/xx Sl Eagle T-Type Axs Power Meter Spider 8-Bolt Direct Mount