... power-off volume. low volume alarm 3.Support OEM/ODM FG560 Optical Talk/LightSet was widely used in construction, testing, maintenance ... it has high call quality, would not affects by distance. FG560 not only has phone call function, but also with a ... + Power Supply AdaptorOptical ConnectorFC/PCWeight(g)600Dimension196×100×40 mm FG560 Optical Talk Set
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