Check the listing for details. Unity Tactical Spark Marker Light Blue Light SPK-BV1. Condition: New. Listed at 24.99 USD. Unity Tactical Spark Marker Light The Unity Tactical Spark Marker Light is a personal identification/marking light in a small footprint. It was originally designed for industrial safety applications, Spark is a practically unnoticeable addition to helmets, plate carriers, chest rigs or virtually any item requiring illuminated visual identification. Purposely simple, Spark’s bright LED is easily activated by pressing its center to cycle between constant-on/blink/off and features a positive click for tactile feedback. It is fully encapsulated in a flexible silicone body, making it water and damage resistant and backed with Velcro for ready placement. Spark is perfect for active IFF on helmets, vehicles, K9’s, and other kit. It is affordable enough to be issued by large agencies and units. Disposable with 200+ hour runtime. Unity Tactical Spark Marker Light Features Setting options, Blink and Off Velcro backing Blue