Taking a look around the device, on the right hand side there's a volume rocker and a power button, nothing on the left, a secondary mic and an IR blaster on the top.
看看手机的周围，在右边有一个音量按钮和一个电源按钮，左边什么都没有，在顶部有一个次话筒和一个红外发射器。
IR blaster
原声例句
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英语百科
Infrared blaster
（重定向自IR blaster）
An infrared blaster (or IR blaster) is a device that emulates an infrared remote control to autonomously control a device that is normally controlled only by remote control key presses. The most common use of an IR blaster is to allow a recording device such as a DVR or VCR to change the channel on an external tuner such as a cable box or satellite receiver. This way, the recording device can automatically select the correct channel to record before starting the recording process. Another common use is to extend infrared signals in order to place remote controlled products behind closed doors.
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