I give MR all the props in the world for these sabers. They have that clash sound set up to go off when you hit another saber even if you do it really gently.
You can't set it off by hitting your hand or arm, not by hitting the bed, or your 10 year old kid, or the dog.
You can set it off easily with anything very hard. The back of a dinning room chair, a plastic house fan, edge of the coffee table, another saber.
Try this.....take an unopened Pepsi/Soda can, lay it on it's side on top of the counter/table and ever so gently tap your saber on the can. I did this by accident one day and found it amazing how gently I had to tap the can to get the clash sound to go off.