Double-Packed Adsorption with Universal Adjustment Highter Load-Bearing, Easily Hold for 5KG Vacuum mechanical valve and removable nano adhesive for higher stabilitu, firm adsorption without falling off. Exhaust the Aire for Tighter Adsorption Pumps out the air in side the suction cup, so the adsorption will be tighter and not easy to loosen. Washable Design for Repeated Use Large nano adhesive layer offers a strong adsorption and is washable for reeated use. Better Viewing Angles with 900 Adjustable Design Built for Various Road Conditions Optimized gear structure to tackle all kinds of bumpiness. Easy Operation with Auto-Fastening Clamp Foldable and Retractable Combo Design Metal Alloy Material for Longer Durability High-hardness aluminum alloy, wear and rust-proof with high resistance to heat.