TF20 police LED torch light use 1pc high performance luminus SST-20 LED generates max 1000lm output. The lamp is powered by a 21700 battery to support at least 3 hours non-stop lighting. Areo-space aluminum material with hard anodized surface finish make the light much more durable. Side switch design, quick click the button to switch high, med, low, strobe modes after to turn on the light.