Find here the owners manual
The adapter for the is suitable for securely attaching ear protection to the FUNCTION Basic Helmet. When carrying out professional maintenance work, you need ear protection that is well-insulated, comfortable, and secure. The STIHL adapter for Bluetooth® ear protection ensures that your ear protection is reliably fitted on the helmet. As the adapter securely attaches the ear protectors, professionals don’t have to worry about movements or vibration.
