On Wednesday, January 11, 2017 at 12:05:34 AM UTC-5, Doug Landau wrote:
On Tuesday, January 10, 2017 at 8:42:04 PM UTC-8, ixiz wrote:
Where can I find more information of what protocol Shimano di2 uses to change gears I would like to add an additional switch so I can change gears at the different hand position

bluetooth

I dont think so - its not wireless