That's what I expected, I wasn't disappointed. I gave it a 4 because it's not very bright in daylight (the sun is shining brightly) but it's visible, the white part and good flash pattern make it usable for days. It blinds you on the dashboard at night, so you need a strip of tape on at least one side. I bought two just to have a spare just in case, but it's well made and at $17 a very affordable price. The magnets are strong enough for the roof. I bought a 12 foot 12v extension to allow the coiled cord to reach the center of the roof without being pulled as tight. I only put it out when needed, but it looks waterproof. Worth the price so far.
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