I would guess, if they really did use toy car radios, that they either picked two with different frequencies, or tweaked the frequencies, or used the PCM (Pulse Coded Modulation) of the signal to detonate the two at different times. Think right/left, go/stop functions on a toy car. That's 3 active functions at a minimum.
Or just used on signal with a delay, intentional or not, on one of the bombs.
What I'm saying is that technically, I could cause a remote event using toy car radios a block away, and time them however I wanted.
I certainly wouldn't want to do that to innocent civilians, but if you want to set up a test, get a spot of desert, and some jihadis, and I'll make their shock collars go off from a couple of hundred meters away.
/johnny
I’m with you johhny, except the shock collars definitely need to be shock and AWE collars for our jihadi friends.
That sounds plausible. Different frequencies and / or one bomb blows up on turn-left and the other on turn-right. Each brother places and triggers his own bomb. That way, they can be sure to be far enough away. And they coordinate via cell phone (one of them was videoed on the phone right before a bomb went off).