Bracketron Mobile Dock-iT Universal Cup Holder Mount is designed for all kinds of portable electronics. The Mobile Dock-iT easily installs into the vehicle's cup holder to provide a stable, secure and easily accessible mounting solution for your portable device. The Mobile Grip-iT's unique design allows its clamping arms to open up to 4.5" wide, accommodating almost all portable electronic devices on the market today. The clamping arms also adjust position allowing you to custom configure it to your particular device and to allow full control of all buttons and functions. The support tabs adjust and swivel, again, allowing you 100% customization. Can be used on cup holders with diameters of 2 3/4 inch to 3 3/4 inch.