You can gently cradle two of them in your hand....
Let me start over.
I can hold all three in my hand and hit the switches to activate them one at a time. If you have smaller hands two is easier. Actually, even for me, using just two at once would probably be less prone to fumbling. If I'm careful I can line up all three switches in the Tactical Deployment Case and they can all be activated at once by pressing down, but like I said before it's hard to get the last one out of the pouch.