LED Strobe Light with Steady-On Feature. The SL-2 is a 360° LED Strobe and/or Beacon visual indicator. LED s not only are more efficient and last longer than standard flash tubes but are also immune to shock and vibration. The LED s are internally positioned to allow a 360° viewing angle when the unit is mounted vertically and a 120° viewing angle when side mounted. The SL-2 can be user programmed to output 4 different flash patterns: Single Flash, Double Flash, Quad Flash or Flicker Flash. The unit can also be programmed as a continuous-On Beacon only, Strobe only or Beacon/Strobe allowing a lower intensity beacon to remain on and a high intensity strobe to be activated by a contact closure. 6 different brightness levels are also programmable for the Beacon and the Strobe. All programming is stored in non-volatile memory so you won t lose the programming when the unit is powered down, allowing you to program units prior to installation. The SL-2 is designed for indoor applications and comes standard with a Blue shatter resistant polycarbonate lens. Optional Red, Amber and Clear lenses are sold separately (go to www.vikingelectronics.com and click on spare parts). Unit surface mounts to wall, post, panel, 4in electrical box or wet location electrical box round lamp holder cover. Applications High noise level area s where visual status is required Signal personnel of equipment malfunctions Warn personnel they are entering a restricted area Add steady on beacon feature to previously installed Viking Emergency Tower phones or BLK- 3-EWP Features Over 57,000 hour (6.5 year) light source life to 70% light output 4 Programmable Flash Patterns 6 Programmable Beacon and Strobe brightness settings Immune to shock and vibration Low current draw Shatter resistant polycarbonate lens.