Do Train-Tech sound capsules require pick-ups?

One of the main features of Train-Tech's sound capsules is that they require no pick-ups or hard-wired connections.

If you have never heard of them before, Train-Tech sound capsules are motion-activated, battery-operated capsules with incorporated speakers that create generic sound effects for engines or rolling stock.

The capsules are self-supporting in that they run from a button battery, and once placed into a suitable wagon, coach or locomotive, will operate every time the train moves despite having no physical connection with the rolling stock. That is possible because the capsule has a built-in motion sensor which is sensitive enough to detect even the slightest movement and will activate a sound file accordingly.