Review on Kolasels Phone Vent Holder: Universal Car Air Vent Mount for iPhone, Samsung, Huawei, Sony, and More 6.5 inch Smartphones by Steve Quinn

Kolasel's phone holder works only marginally. For my use on a rough road, the spring loaded phone grip doesn't hold the phone tight enough. The same applies to the ventilation grille. Rather than tightening a screw on the vent, it has a lever drive that grips but isn't very tight. For a street car this might be good so I give it 3 stars. But in any case, in the event of a bump or bumpy road, the phone will fall out of your hand, or the bracket for the ventilation louvers will slip off.