Our new LM-803 Cup holder mount height can be adjusted from 6 1/2" to 8" From the top of the adjustable base. The base can be expaded from 2 1/4" to 3 3/4" in diameter by turning the expansion knob. This package includes our new LM-EXT-6 Which will accomodate a Uniden Scanners button mount our belt clip. If you use the button mount, you can use your extended life battery, just remove the belt clip to expose the button mount. the button mount will slide into the slot attached to the extension plate. If you want to use your belt clip, just clip it over the extension plate. This package also comes with a smart phone mount. The mount will accommodate any smartphone with or without a case. The holder has a spring loaded mechanism that can be released with the push of a button. Simply place your smartphone into the holder and squeeze the padded side grips tight. To release simply push the button on the side.