The K750i is a candybar style phone that weighs 99 grams (3.5 ounces), with its buttons that can be used with any finger. It has the 'dual-front' design common to most Sony Ericsson mobile phones since the T610, with the back of the mobile phone designed like a digital camera and intended to be held sideways to take photographs. The K750i is available in four colours, Blue, Oxidized Black, metallic red and Blasted Silver (the latter of which is exclusive to Vodafone in the United Kingdom) with a red version later released. The central joystick button is used for selecting options and navigating menus, with the "C" button as an 'undo' or 'delete' button, and the arrow-labelled button as a 'return' or 'back' button. The two buttons labelled by white horizontal lines, known as 'hotkeys' or 'soft keys' perform the function of making binary decisions, labelled on the phone's display. The button in between of these 'soft keys' acts as a shortcut key, which brings up a user-customisable shortcut menu when pressed. The on/off button is located on the top of the phone next to the IrDA port.