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Updated review, I've had this unit for a year now and the Suction cups are no good they have gone flat and won't stick to the window anymore.. All the metal parts are in New condition.. I guess the Southern Arizona heat is to hard on the rubber cups.. Trying to find replacements..
It worked the way it should, But, the spring is a little on the strong side, so you might have to clamp it in the compressed position overnight..I mounted mine on the rear window of my truck.. Make sure window is clean, or suction cups might not work well..