"Size Wireless keyboards come in a range of different sizes, with some more portable than others. No matter what size of keyboard, all models will come with the letter, number and control keys, such as Shift, Ctrl, Alt (or Command on a Mac) and Return that you'd expect to find on a keyboard. Some also feature an additional number pad to the right-hand side."
"Key type Keyboards come in two different key types; mechanical and membrane. Mechanical keyboards have switches under each key, which activate when a key is pressed down, whereas membrane keyboards use a plastic sheet that has electrically conductive ink underneath, on top of a circuit board. When a key is pressed, the ink makes contact with the circuit board, closing the circuit to ensure the keystroke is reflected on screen."
Wireless keyboards vary widely in size, from compact portable layouts to full-sized models with an additional numeric keypad. Compact designs often reposition arrow, editing, and function keys, and may use dual-function Fn keys to conserve space. Keyboards use either mechanical switches or membrane technology; mechanical switches offer greater tactile feedback, durability, and easier key replacement, while membrane designs rely on conductive ink and tend to be lighter and less expensive. Battery life determines time between recharges or replacements. Models using traditional replaceable batteries often provide longer runtime than some rechargeable designs.
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