[The KG9 Kid]

I’d expected to see no electronics that weren’t from a mobile phone, and that’s not mobile phone electronics. The circuit board is another level of complexity in an IED.

Interesting that a Tenergy CR123 battery is found. They’re rechargeable. They’re also not intended for use in LED flashlights that use circuitry because they have voltage spikes that can damage electronics.

[swamp40]

I don't see anything mobile phone related.

I see boring low-tech cheap RC or electronics hobbyist parts.

The trigger would be one of these: