Ideal for applications where electrical power cannot be provided.&nbsp;&nbsp;Tritium-filled gas tubes require no electrical input or external light source and are rated for 10-year luminous life (20-year life option available).&nbsp;<br><br><ul><li>Universal directional indicators and mounting(canopy included).</li><li>Completely sealed housing. Suitable for wet locations.</li><li>Tamperproof mounting hardware included.<br><br>Three-year limited warranty (varies with luminous life option chosen).</li></ul>