LG LM-W319 Quick Start Manual page 28

Wrist and Next-to-Mouth operation
This device was tested for typical Wrist operations with the back of
the device kept 0 inches (0cm) between the user's Wrist and the back
of the device.
And this device was tested for typical Next-to-Mouth(Face) operations
with the front of the device kept 0.39 inches (1cm) between the user's
mouth(Face) and the front of the device.
To comply with FCC RF exposure requirements, a minimum separation
distance of 0.39 inches (1cm) must be maintained between the user's
mouth(Face) and the front of the device.
Any accessories containing metallic components may not be used.
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