Here is an spectacular way to cast the functionality of an authentic QWERTY -keyboard across any flat surface. With the Projection Virtual Bluetooth Keyboard you can carry this device in a backpack or pocket and hook it up through a usb connection to dazzle and amaze. The Red laser diode will operate for a full 120 minutes before needing to be recharged. Unless you regularly type faster than 350 words per minute the laser show will detect your fingers and type out your words on screen. The device is fully compatible with all operating systems — although the mouse function is only for Android devices– and it can be connected via USB or Bluetooth.