Sena RC4 and (semi automatic) can't work.
I was searching around and never found any information so I ordered a remote (RC4) for my Sena 20 egos. Just to give everyone heads up incase you ever need wanted to know. The downshift button when pulled back hits the remote:yikes: If you ever plan to manually downshift to gain power etc on a hill the remote can't be placed on the handlebar. It DOES fit on the passenger grip though;) So your passenger can use it and it is very sturdy on the passenger grip too. Therefore she doesn't have to fumble around on the side of the helmet. Just thought I'd share.
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