[. . . ] [. . . ] Lightweight design The durable, lightweight quality materials enhance comfort for extended wearing. Automatic Level Control (ALC) This smart electronic circuit ensures that the audio input level is automatically adjusted to the right level, preventing distortion and preserving your listening enjoyment. 32 mm speaker driver The 32 mm speaker driver is a compact yet powerful element for delivering non-distorted sound with any given input power. FM Wireless transmission With high-frequency FM wireless transmission, which can even pass through walls, you can even listen to your music when you're in another room. [. . . ] [. . . ]