ping
If we ever go to war with China they will know our moves before the field-grade officers even get the orders.
For those non-technical, it requires someone to open the box, de-solder devices and then wire in an additional PCB.
Its probably wired into the interface with the keyboard controller for tracking key strokes.
Its actually easier to send someone a gif in email with embedded software to do the same thing.
Building your own computer with a 500 dollar motherboard includes the 200 dollar spy chip.