Suitable for any of mobile, GPS, PDA, MP3, MP4 button to regulate width : Maximum width-110mm : Minimum width – 45mm From drivers closer, hands-free super-convenient answer the phone, navigation sight The maximum opening , fully supports the current popular smartphone navigator. Security: The device is highly compact steering or dashboard, wheel can be moved, there is no safety risk Protection: The device is embedded soft silicone pad to protect your phone from scratches or scratched and so on. Wear resistance, high toughness made of environmentally friendly materials, can be used for a long time. The device does not affect the steering or dashboard, wheel cover is installed.