Accurate, reliable power measurement is almost a prerequisite these days, and the Apex AXS crankarm power meter upgrade is the easiest way to get accurate power readings. With the technology hidden in the DUB spindle, the crank fits almost any bike. The crank arm measures power on the left side and calculates total power. The power meter has a long battery life of up to 400 hours and is easily replaceable with an AAA battery. The power meter is waterproof to 1 meter for 30 minutes and is only 40 grams heavier than the standard crank. Quarq accuracy and reliability With a small upgrade to the left crankarm, the Apex 1 Wide crankset features this accurate power meter from Quarq. The technology is integrated into the DUB spindle and is easy to install. Long battery life of 400+ hours AAA battery Waterproof (IPX 7 up to 1 meter, 30 minutes) With this power meter, the crankset is only 40 grams heavier than the standard crankset Sram Article Number: 733384 EAN code: 710845886348 Supplier number: 00.3018.346.004 Retail packaging: Yes