4iiii Innovations Precision 3+ Power Meter 105 7100 165mmFeatures support for Apple Find My Up to 800 hours of battery life, an automatic terrain selector, + 1% accuracy, waterproof, light weight (9g), low profile, indicator light, ANT+ Bluetooth Backed by an industry leading 3 year warranty While you are riding, Precision 3+ Power Meter will transmit watts, cadence, and calories to your head unit of choice While the power meter is not in use, Find My is enabled and allows you to see its location on a map