HD, which means "HD" in Chinese, AKG has four headphones with the suffix "HD", namely K272HD, K242HD, K172HD and K142HD. Therefore, the wearing design must make the headset clip tighter.

The development track of the audio industry is made up of a series of key events. In the second half of 2012, DOSS brand released a new asimo 3 generation speaker.

In October 2012, skynet conducted a one-month online survey on bluetooth speaker consumption, and collected more than 1,000 valid questionnaires.