No understanding of microcontrollers, a PC to program them or a specially constructed transmitter is needed. A cheap esp8266 powered sonoff switch is set to go

No understanding of microcontrollers, a PC to program them or a specially constructed transmitter is needed. A cheap esp8266 powered sonoff switch is set to go. The bomb maker just needs to solder the incoming and outgoing lines to clearly marked spots on the board. The switch paired with the eWeLink app on an old throw away Android phone and then the bomb can be set off from anywhere in the world.