Unity SPARK™ Marker Light is a tiny, disposable marking light designed to provide rapid visibility of personnel or objects. A completely sealed unit, SPARK™ is waterproof for function in a multitude of austere environments. It attaches to surfaces with a hook and loop backing. When paired with the SPARK™ CAGE, it can weave onto webbing or snap onto metal surfaces with magnets. Pressing the center of the silicone housing, SPARK™ will cycle through its output functions. The constant feature is good for low light training while the blink output acts as an emergency strobe beacon.