General Spec Function provide a stable support for device Compatibility most models of Cell Phones, PDAs, GPS, iPhone, iPhone 3G, iPhone 3GS, iPhone 4G, iPod and other handheld devices Others Features Enjoy your music and use your GPS programs without having to hold the devices in your hand. This mount gives you convenient access and view of your devices while allowing you to comfortably keep your eyes on the road. Clip the holder onto your car's using the vacuum base, you can safely and securely attach your devices to any vehicle's windshield. Extra-firm gooseneck absorbs vibration, providing a stable viewing environment. Sticks strongly to your windshield window. The flexible goose-pipe allows bending and turning to use this with virtually any vehicle. Keep your devices securely in place, while you can adjust the holder in a 360 degrees direction.