Eflare™ Portable Warning Beacons are essential when you need to alert hazards to others or provide a safer working environment for you and your people. The Eflare™ does not produce toxic fumes, burn personnel or clothing, affect distance judgment or night vision and there is no risk of fire or explosion. The unit is waterproof and shatterproof. The 500 series comes with a rubber detachable base and requires two D cell batteries (not included). The 300 series requires 4 x AA batteries (not included).