Cisco 521 Manual page 5

Warning
In order to comply with FCC radio frequency (RF) exposure
limits, antennas should be located a minimum of 7.9 in. (20 cm)
or more from the body of all persons.
Warning
Do not operate your wireless network device near unshielded
blasting caps or in an explosive environment unless the
device has been modified to be especially qualified for such
use.
Warning
Do not work on the system or connect or disconnect cables
during periods of lightning activity.
Warning
Read the installation instructions before you connect the
system to its power source.
Quick Start Guide: Cisco 521 Wireless Express Access Point
5