Okay so first I have Shoei Neotech II helmets with Sena SRL in both. I just upgraded my phone from a Samsung Galaxy S8 to an S 21. With the 8 it was easy to stream via bluetooth to both helmets at once. With the new 21 I can't get that to work. On the 8 there was a simple switch to throw to bluetooth to two seperate devices. On the 21 you have to go to the advanced setting where there is a music share switch. I threw that and then down below you have to click which two devices to share to. Did that. Yesterday it worked and now today no matter what I do it won't do both. Just plays in one helmet and then if you try and make it play in both it just switches helmet. I am at a loss., I guess we can each carry a phone but it should work.