Unique and Patented Flashlight & Beacon System all in one. Runs on 4 x CR2032 button cell batteries. Run time 30-50 hours. Constant ON or FLASHING modes. Extra Bright LED lamps and Patented High Reflective housing allows visibility well over one mile. Extra strong magnetic base and lanyard included. Can be attached to Maglite and Streamlight D cell flashlights, without using flashlight batteries. Can be independently used on the magnetic base or screw onto tripod. Virtually indestructible.