Sennheiser WiCOS Instruction Manual page 89

Manufacturer Declarations
Before putting the device into operation, please observe the respective
country-specific regulations!
USA (WiCOS BA only): Meets the requirements of the UL 1642 safety
standard. The devices can be operated license-free in most countries of the
European Union. For more information, please contact your local
regulatory authority for radio and telecommunications or your Sennheiser
partner.
87