car universal holder, universal holder for MP3,MP4,mobile,GPS,PDA etc. Buttton to regulate width:48mm-108mm. Back with 360 roating support holder. Strong cupule. Operational instructions: 1. Insert foot-rest to the bakc of the main unit. 2. Move off protection paper from the bottom of cupule. 3. Make cupule of foot-rest direct towards windshield and press then lock it. 4. Press the button for clamp arms extending,put PDA or Mobile in the holder and grip it.