I have 3 ph2's (1) on 2.4 (2) on 5.8 thus I have a few controllers. (1) rechargeable with thumb wheel (2) regular batteries. One has the switches labeled with Cl, HI etc the other just labeled S1 S2. Is there any difference? I imagine the 2.4 ghz controller and PH2 will get me more distance then the 5.8? This 2.4 I have had a fat shark 5.8 video transmitter but there was a coil broken on it so I disconnected the setup.