Microelectromechanical systems:
Microelectromechanical systems (MEMS) (also written as micro-electro-mechanical, MicroElectroMechanical or microelectronic and microelectromechanical systems) is the technology of very small mechanical devices driven by electricity; it merges at the nano-scale into nanoelectromechanical systems (NEMS) and nanotechnology. MEMS are also referred to as micromachines (in Japan), or Micro Systems Technology – MST (in Europe).
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An on-screen display (abbreviated OSD) is an image superimposed on a screen picture, commonly used by modern television sets, VCRs, and DVD players to display information such as volume, channel, and time.
Pidgin OSD system
Pidgin OSD system
Pidgin OSD system
These are some picture of Pidgin OSD system.This system is not manufactured by any manufacturer.
My friend make it by him self ! 
Click here to see the video of Pidgin OSD stem
Is the range of 2.4g device shorter than traditional 72mhz device?
Whether the 2.4g device safer than 72MHZ device or not？
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