* Bluetooth low energy technology and ANT+ wireless data transfer* MagicZero – automatically checks and recalibrates your power meter as you ride no need to manually calibrate* AxCad — no cadence magnet required* 10K Temperature Compensation* Battery — CR2032, 200-hour battery life, change without tools* OmniCal — swap chainrings without affecting accuracy* 2-year warranty* IPX7 waterproof rating* Accuracy — within 1.5%, measuring both legs.* SRAM Model ID: PM-XX-1-C1