Sennheiser AC 3 Instruction Manual page 19

Manufacturer Declarations
18 | AC 3
FCC & Industy Canada Information
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including
interference that may cause undesired operation.
This class B digital device complies with the Canadian ICES-003.
Changes or modifications made to this equipment not expressly
approved by Sennheiser electronic Corp. may void the FCC
authorization to operate this equipment. Before putting the
device into operation, please observe the respective country-
specific regulations!
Radiofrequency radiation exposure information:
This equipment complies with FCC and IC radiation exposure
limits set forth for an uncontrolled environment. The AC 3
should be installed and operated with a minimum distance of
20 cm between the radiator and your body.