GolitonCar Mount/Holder Support Rack Easy to Install for Digital Camera/tachograph Material: ABS plastic Applications: automobile windshields and other smooth surface Remove the protective film Sucker bottom bracket the suction cup suction cup bracket toward the clean car has pressed flat glass, then place Banxia pressure valve and confirm sucker stand firmly adsorbed through the primary and secondary tuning knob rotation with the rotary member, by appropriately adjusting the angle of their needs