Do I literally have to describe every single piece of technology down to the circuitry? 

Because I can.

The detonator has two buttons, one for the right arm and one for the left. The left is closer to the palm and the right is further, this allows him to detonate them either simultaneously or individually. It's easily concealed in his massive hand but when his hand went limp it slid forward and both buttons were pushed. This set it off.

And if you want me to explain it simpler, it's like multiple wavelength RC controllers. Each one has a different signal.