A virtual laser keyboard can connect to your mobile, tablets, or PC and projects an image of a virtual keyboard onto a flat surface such as a desk or a table. Then you can type on the projected keyboard surface area rather than pressing physical keys. The device detects the keyboard movements, determine the pressed keystrokes, and translates it to text. You can connect to your smartphone, tablets, or laptop by USB cable or Bluetooth wireless technology. Most devices come with a setting for virtual mouse.
A virtual keyboard (or mouse) can be useful when you do not have access to keyboard and may work for persons who have bigger fingers, poor vision or the slower typist. Virtual keyboards or virtual mice are an innovative idea that came out about four years ago. However, it still needs to overcome challenges of being used in variety of environments and being accepted by all types of users.
Most users reported that virtual keyboard is not like your common keyboard, and it takes time to get used to it. Virtual keyboard requires solid and non-reflective surfaces for working projection and typing. It is portable to travel, but it is difficult to use it in a plane or train because most devices need to be placed in an upright position. It has delay when typing so if you are a fast typist, it may not capture your typing. If the environment has too bright, it may not return accurate results. You cannot turn off the feedback sound on some devices. Its stability and accuracy need improvement. The mouse feature requires a steady hand.
You can find discounted virtual keyboards around $30 compared to the original prices of $200, which was the average cost a few years ago. If you decide to buy one, here are some options of virtual keyboards you can find today.
(YouTube: 6 Best Virtual Keyboards by Ezvid Wiki)
Please note this list is from January 2017 so the list may have changed since then.