1x specific for use with 10-46T XPLR 13-speed cassette and Flattop chainsHangerless Interface and Full Mount attachment allow for the most precise shifting and the ultimate resistance to impactMagic Wheel keeps the chain moving, even if debris enters the lower pulleySimple setup with no adjustment screwsReplaceable and rebuildable partsBattery not includedForce eTap XPLR AXS12/13sp46BLKUPC/EAN/GTIN: 710845916779