All modules available in MSTS system are using the same standard casing which is water and dust resistant. Current class is not lover that IP44, but they are under further tests.
Rotating module
Depends on the picture on each of the sides – you should shoot or not.
Application internal icon 
Dimensions (LxWxH): 30cm x 20cm x 21 (with holder, 12cm without). Weight – 4kg
Pyrotechnic module
It can initialize smoke flare or other types of fireworks. There are 2 wires which can be used to initialize two separated pyrotechnic packages.
Application internal icon 
Dimensions (LxWxH): 30cm x 20cm x 10cm. Weight – 2.8kg
Popper module (pictures and description soon)
Dimensions without holder (LxWxH): 30cm x 24cm x 10cm.
Sample premium package of modules can look like below
More types of modules are in preparation including sound, light modules and not only.
Also in near future modules will have extensions to make the training even more interesting, challenging and fun.