SATO WS4 Series Operator's Manual page 3

Disassemble or modify this product.
∙
Remove the certificate label (serial number seal) affixed to this product.
∙
Use of this product near microwave and/or other Wireless LAN equipment,
or where static electricity or radio interference is present, may shorten the
communication distance, or even disable communication.
WARNING
Changes or modifications not expressly approved by the party responsible
for compliance could void the user's authority to operate the equipment.
ii
(for USA only)