Asus DSL-AC88U Annex B Schnellstartanleitung Seite 16

Effective use of the radio spectrum – Article 3.2
Testing for radio test suites according to EN 300 328- 2 has been
conducted. These are considered relevant and sufficient.
CE Mark Warning
This is a Class B product, in a domestic environment, this product
may cause radio interference, in which case the user may be required
to take adequate measures. Operation Channels: CH1~11 for N.
America; Ch1~14 for Japan; CH1~13 for Europe (ETSI)