https://bike.shimano.com/en-US/information/news/new-shimano-105-di2-delivers-12-speed--shifting-and-wireless-per.html https://bike.shimano.com/en-US/information

https://bike.shimano.com/en-US/information/news/new-shimano-105-di2-delivers-12-speed--shifting-and-wireless-per.html https://bike.shimano.com/en-US/information/news/new-shimano-... It's not clear to me that the wireless shifters themselves communicate via Bluetooth, though the system does use that to talk to a smartphone app, if desired.