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What is the rubber cover and the port in the back of the handset near the antenna?

April 26, 2017antenna cover Handset near port rubber

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What is the rubber cover and the port in the back of the handset near the antenna?

1 Answer

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That is a port used by the technician to test or calibrate the handset. It is recommended that the cover not be removed to keep the inside of the handset free from debris.