Easy to Install No Tools Required. Strong Suction Cup Sticks Securely on Your Car Windshield. Compact， Lightweight Design The Unique Arms of the Holder can be Adjusted to Safely and Securely Grip Your Cell Phone by the Push of a Button 360 Degree Rotation in Either Direction. Adjustable Holding Width From 46mm to 95mm Allows You to Select Any Mounting Angle You Would Like， for Vertical or Horizontal Mounting Almost All Types of Ipods /PDAs /GPSs /Cell Phones (Iphone 5S， 5C， 5， 4S， 4， 3GS; HTC， Samsung， Nokia， Blackberry， etc) Only the car holder， not include the cell phones. How to use? 1.Insert the lock nut into the base neck，connect the lock and the holder to the base with the lock nut.The holder can rotate 360 degrees. 2.Remove the protective film from the suction cup. 3.Place and lock the suction onto the windshield by pressing the lock knob on the base.Suction cup works best on a clean area of the windshield. 4.Put the device in the middle of the holder，push to close the arms to firmly secure the device. 5.Press the button at the middle bottom of the back release the device.