Shimano sm ewwu101 di2 wireless unitshimanos sm ewwu101 di2 wireless unit brings another dimension to your di2 experience by offering wireless connectivity for performing software updates, error checking, and shifting customisation even on the go'. '.strtoupper('t')his unit easily plugs into shimanos e tube wiring system and is powered by the same battery that powers the di2 system.connect and monitorthis unit offers both ant connection and bluetooth connection, so it can connect to compatible cycle computers to enable you to monitor gear position, battery life, and other rider data functions'. '.strtoupper('m')echanics can use the e tube project wireless app to connect via a tablet or smartphone to change shifting preferences to suit the rider or the type of road terrain'. '.strtoupper('f')eatures compatible with dura ace 9150 and 9070 di2ultegra r8050, 6870, 6770 di2 xt di2 and xtr di2 please note the new integrated bt dn110 battery or the external battery mount bm dn100 is strictly required compatible with garmin edge 1000 and pro scio ant cycling computers bluetooth connectivity powered by di2 shifting system battery plugs inline anywhere in compatible systems, external mounting recommended requires additional e tube wire smart phone control drivetrain customisation, firmware update tablet control drivetrain customisation, firmware update, error check, pre set dimensions 38mmx25mmx12.5mm weight 5ga 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.