Chess rounds last a total of 4 minutes, with the players wearing headphones to block out cheers, coaches' advice and the commentator's voice.

象棋总时间为4分钟，两人头戴耳机，以免受到观众欢呼声、教练指点声和评论员声音的干扰。

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Headphones - personal music players come with small ear buds with sound quality from pretty good to marginal.

耳机-个人音乐球员前来小耳芽与音质不错来自边缘。

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Founded in 1985, the company offers a variety of technology ranging from designer headphones to MP3 players and tablets.

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At the higher end, a few stores specialized in rice cookers and vacuum cleaners, and a few others sold headphones and MP3 players.

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There are a variety of simple headphones for personal stereos or MP3 players, and headsets with microphones for mobile phones.

BBC: NEWS | Programmes | Click | Click Essentials: Bluetooth