wattmetr pro kliky SRAM - bez klik a převodníků IPX7 waterproof, anti-dust casing with a closed magnetic rechargeable design protects the PowerPro from water or dust while riding 107mm BCD for SRAM Force and Rival 4 bolt 1x or 2x chain rings High-capacity lithium battery delivers up to 150 hours of riding on a single charge Built-in magnetic connector makes recharging easy Green and red LED Indicators display connection and battery status Weight155g (spider only) Size125*125*200mm / 4.9*4.9*7.8 inch (L*W*H mm) Waterproof PX7 Bolt Pattern4 Bolt Bolt Circle Diameter (BCD)107mm Chain Ring Compatibility1x ,2x ConnectionsBLE/ANT+ Battery TypeLithium-ion Battery Run Time100 Hours Battery Charge Time1 hr Battery Life IndicatorYes Accuracy± 1.5% Temperature Conpemsation Yes Left/Right Balance Yes Pedaling Efficierncy No Firmware Giant Ridelink Warranty 2 Years