Suitable Mounting Surfaces: Install the suction cup only on a smooth, flat, clean, dry and non-porous surface. Textured, curved, soft, dusty, oily, waxed or polished dashboards may reduce suction. Secure Suction Installation: Clean the surface and suction cup, press the base firmly to remove trapped air, then fully engage the locking lever. Pull the holder gently to check stability before inserting the phone. One-Button Phone Clamp: Press the rear button to open the clamp arms, place the phone centrally on the lower support, then press both arms inward. Check that the phone cannot slide before driving. Adjustable Viewing Angle: The 360-degree joint supports portrait and landscape viewing, while the adjustable arm extends from approximately 9.5 to 15 cm. Position it without obstructing the road or controls. Compatibility and Safe Use: Suitable for most 4-7 inch smartphones. Very thick cases may affect secure clamping. Park before installation or adjustment and repeat the stability check before every journey.