NEC SA3500G Instruction Manual page 7

Notes on Wireless LAN
(1) The standard values of wireless LAN are the maximum theoretical
values when communication is carried out with other devices
with the same configuration as this product. The standard values
may not indicate the actual data transfer rate.
(2) The interoperability of this product with third-party products is
not guaranteed.
(3) Wireless LAN transmission distance and speed varies greatly
depending on objects such as walls and furniture.
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