The BLS is now available in two types, Model A with the dome LED, and the new Model B which allows you to use your standard buoys to create a buoy model with the appropriate light sequence!
This could provide more in-depth training fun, as your pupils can reverse engineer the buoy from the light sequence and solidify their learning.
The software and base designs are identical, and the Model B works perfectly fine without the buoy bodies, its a smaller lens housing (but uses the same piranha led).