4iiii Pm Non-Drive Side Arm Precision, Gen3, Ultegra, R8000, NdsFeatures With up to 800 hours of battery life, you wont have to worry about changing your battery for years to come. At only 9 grams the PRECISION 3+ Powermeter weighs about the same as a sip from your water bottle. Our goal is to help you get faster, not to slow you down. With an ultra low profile design, your 4iiii power meter is compatible with more bike frames than ever before. Not everyone has the perfect pedal stroke. With + 1% accuracy, 4iiii