the m3x is actually a sea saw switch, if you flip it up, on the right side it locks on, it you push it down, on the left side it turns on but turn off when you stop pushing down. you can also get pressure switches for them.
I really like mine, And i find it extreamly easy to use, specialy if the Vert grip is close to it, you can controle it with ur thumb if its on the left side of ur RIS
its very hard to explane, but there very easy to use