The holder is made of ABS plastic. The holder has a perfect fit. It is easy to put the device into the holder, and just as easy to take it with you when leaving the vehicle. The holder is equipped with an Apple approved cig-plug cable for connection to the vehicle's 12 Volt socket. When you place the iPhone in the holder, it automatically connects to the charging unit. If you have a car with USB interface, you can disconnect the cig-plug from the holder's cable in order to get a USB-cable to connect directly to the USB connector in your vehicle.