Roland trigger module

1. What does a trigger module do?
2. What is Roland tm2?

What does a trigger module do?

In drumming, a trigger is an electronic transducer that can be attached to a drum, cymbal or other instrument to enable it to control an electronic drum unit or similar device.

What is Roland tm2?

Compact trigger module that gives acoustic drummers the creative features of electronic percussion. Over 100 ready-to-play professional sounds, ranging from acoustic drums and percussion to modern electronic instruments.