Motorola L3391 Owner's Manual page 5

"SAFE USAGE NOTIFICATION:
For reasons of personal safety and optimal radio performance, Motorola
has designed the ML850 with an intended purpose and position of use
either in a secured vehicle docking station or on the top of an office
desk. Motorola strongly recommends using this product in a vehicle
only when it is physically-secured in a locked or assured-stationary
location as failure to do so may cause the product to cause harm in
accidents or other conditions. Similarly, Motorola strongly recommends
that the unit not be situated for a prolonged period in an a position that
places the antennas directly against the human body (for example, by
'tucking' an operational, radio-equipped unit under one's arm).
NOTE: The radio modems in the ML850 may continue to transmit and
receive signals even while the laptop is in a closed position. Failure to
follow any part of this notification could cause degraded radio
performance or harm to the user".