70 mm signal towers:

Signal towers can be put together by piling up to seven modules made of:

1. Up to seven light modules, either steady or flickering; if a sound module is needed, subtract one.
2. Include a termination connection module.
3. Include mounting hardware as needed.

• Light modules with either a constant or flickering light.
• Waveforms: sine, cosine, and pulse.
• Constant light modules with an LED or a standard BA15d lamp filament (not provided).