When you need the absolute best from your training data, the accuracy and reliability of the RED XPLR AXS Power Meter is the way to go. The spider design uses a proprietary thread-on chainring mount system which allows us to reduce weight and increase stiffness without compromising the ability to swap rings. A dual sided power measurement system, it's accurate to +/-1.5% even as weather conditions change, and boasts unbeatable battery life.Features: - Thread Mount design is light, stiff and accurate- User replaceable CR2032 battery with 200-hour battery life- Bluetooth low energy technology and ANT+ wireless data transfer- MagicZero automatically checks and recalibrates your power meter as you ride- No cadence magnet required- 10K Temperature Compensation- Waterproof (IPX7 waterproof to 1 meter for 30 minutes)- AXS™ enabled for easy monitoring and firmware updates- RED XPLR AXS spider is for 1x XPLR chainrings- Force AXS spider is for 2x chainringsSpecifications:- Bolt Circle Diameter (BCD): Thread Mount- BB Spindle Interface: DUB- Power Meter Type: Ant USB- +/- 1.5% accuracyTechnology:AXS:- AXS is SRAM´s new bike component integration system that connects electronic bicycle components and software. The SRAM AXS app allows riders to see battery status, change component behavior, personalize controls, get maintenance reminders, and update firmware.DZero:- Quarq´s next-generation DZero power meter platform is named for the DO Experiment, one of science´s most accurate and innovative projects to detect subatomic particles moving at the speed of light.