Nokia CK-10 User Manual page 10

GSM antenna (component 12)
A compatible GSM antenna (not included in the sales package) enables optimized
wireless connections. To use an external antenna, you need an antenna coupler
and/or compatible phone holder (sold separately).
Note: If you have installed an external antenna, remember that in order
to comply with RF exposure requirements for mobile transmitting
devices, a minimum distance of 20 cm
(8 inches) must be maintained between the antenna and all persons.
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