WAutomatic watch
WCurrent sensing
WDigital micromirror device
WElectroactive polymers
WElectromagnetic acoustic transducer
WHall-effect sensor
WHeadphones
WInterdigital transducer
WMicroelectromechanical systems
WOrthomode transducer
WPiezoelectric accelerometer
WPiezoelectricity
WPlasma speaker
WPotentiometer
WSensor
WSmart transducer
WSound amplification by stimulated emission of radiation
WSynchro
WTactile sensor
WVibration-powered generator
WWax thermostatic element