Google Image Result for http://www.tabletkiosk.com/tkstore/pc/catalog/img_i400D_stylus_list.jpg This is a stylus. It is used to select things on the screen by touching the screen with it. It is like a portable mouse that you mostly don't have to plug in.
Google Image Result for http://1.bp.blogspot.com/_ZFz19SRjFYY/TPtisN0rdyI/AAAAAAAAAAM/SALlN9iNC1Q/s1600/camera.jpg This is a computer mouse. It plugs into the System Unit and is an input device. It allows you to select a button, a menu, an icon, a link, or a text. It inputs a pointer into the computer.
Google Image Result for http://www.build-your-own-computer.net/image-files/computer-keyboard-01.jpg This is a computer keyboard. It is an input device because you plug it into the computer in order for it to work. It enables you to type intructions or data into the computer.
Google Image Result for http://4.bp.blogspot.com/_o801UUtSFEI/TPuFpW7W6xI/AAAAAAAAABs/OpEHonWk-_A/s1600/51BluetoothAdapter.jpg This is a flashdrive. It is a small, portable hard drive that is inserted into a USB port of the System Unit for getting data or storing something.
Google Image Result for http://ict123.files.wordpress.com/2010/11/input-devices_7.jpg This is a microphone. It is plugged into the computer so you can speak into the computer. It is used for Online Internet Chatting and other games or programs. It inputs sound into the computer.
Google Image Result for http://www.itechnews.net/wp-content/uploads/2009/01/jvc-kw-nx7000bt-av-navigation-receiver.jpg This is a Navigation Reciever. It is used to hook onto a car to show you directions. You can ontain maps and directions using this