This is a Streamlight Flashlight known as the SL-20L, model 20703.
Feature packed" the SL-20L(TM) full sized professional grade" high-intensity" rechargeable flashlights offer 3 microprocessor controlled variable intensity modes" strobe mode and the latest in power LED technology. The combination of rechargeable batteries and the C4(R) LED results in one of the lowest operating costs of any full size flashlight made
Features:
Deep-dish parabolic reflector produces a tight beam with optimum peripheral illumination
C4® LED technology, with a 50,000 hour lifetime