The pulsating, rotating lights in our Roadside Emergency Beacon are visible up to 8,000 feet! And unlike traditional flares, there's no risk of fire or burns. Water-resistant. Uses 4 AA batteries, included. 8" x 2".
I ordered two of the flashing beacons last year and plan to order two more this year. They are quite bright and compact. I've never needed to use mine, but it's nice to know it's handy, especially when the snow flies! Only drawback I can see is the plastic easel stand, which could conceivably break.