Excellent. I got these emergency lights and they were very easy to install. I took it out of the box and installed in less than 5 minutes. The power cord plugs into my car's cigarette lighter port, it has a button to turn on the light and change the flash pattern in a variety of ways. I have a blue and red light version. The intensity of the light is actually very high and can be seen from afar even in daylight. One of the nice things I love is that even though they are attached to my windshield with suction cups, they have never fallen off.
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