I don't use suction cups but I'm sure they're ok. I bought them for work in my spare time and they work great. Lots of bright colors and lots of patterns including alternating red/blue and left or right directional. The brightness of this compact stick matches my patrol car. I am impressed with the quality of this $36 bar although I had to return 2 of them before they sent me one which was not damaged in transit. The company should be more careful because the outer box was not damaged, but the first two light bars were damaged by a fall. It must be determined whether they stand the test of time.
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