Nathan Mag Strobe Reflective, Night Safety Lines : The Nathan Mag Strobe(TM) is a safe and convenient clip on strobe light to keep with you while out after the sun goes down. This long-lasting and bright strobe style light clips easily onto clothing and gear, helping you be seen during runs or hikes in dark and low-light conditions. Provides 2400 ft LED visibility. Reflective, magnetic clip-on style. Provides 25+ hours of light on continuous mode and 40+ hours on slow and fast strobe.