Edwards AdaptaLight series 101XBRM stackable beacon is a unique signaling appliance which can contain up to five modules, stacked onto a single AdaptaLight base unit (as illustrated above). The 101XBRM series can be combined or stacked with any of the models only if modules have same input voltage. The 101XBRM led series is supplied in steady-on mode but offers a field selectable 65 fpm flash mode. Up to five modules can be used in any position in the AdaptaLight stackable beacon.