Trendnet TRENDnet Wireless Office Headset 11.30.04 ユーザーズマニュアル

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2. Product Detail 

The 2.4 GHz Wi-Fi Detector has buttons to activate signal detection and LEDs 
to indicate the strength and type of signal.

English

LED's for devices

LED's for 
signal strength 

LED for battery power  

Buttons for signal detection