www.safetyandhealthmagazine.com/articles/battery-powered-led-beacon-2

Battery powered LED beacon

November 1, 2011
The Magnalight CS-A-24LED Strobe Beacon can be mounted to any surface that accepts a magnet. It is powered by four AA batteries to produce up to 40 hours of runtime, and can be operated in a strobe or constant “on” mode. The beacon can handle vibrations and movements associated with work operations, and is visible up to three miles.

Larson Electronics