Edwards AdaptaLight series 101 stackable beacon is a unique signaling appliance which can contain up to five modules, stacked onto a single AdaptaLight base unit (as illustrated above). AdaptaLight modules are available in steady-on incandescent (101SIN), steady-on halogen (101SINH), steady-on led (101SLED), flashing incandescent (101FIN), flashing halogen (101FINH), flashing led (101FLED), or strobe (101ST). Up to five modules can be used in any position in the AdaptaLight stackable beacon.