Sena Bluetooth SPH10 v4.2 User's Guide - Manual (Page 41)

SPH10
42
WARNING
Sena informs that using this device in public traffic
may not be authorized by the law. Please check your
local law and use this device only out of public traffic
such as private properties or closed circuits. If the
simultaneous use of both ear speakers while riding a
motorcycle is prohibited by your local law, please use
only a single ear speaker while riding. Sena denies
any liability should you choose not to respect this
warning.
Using the headset with loud volume may be harmful
to your eardrums and cause hearing loss. Please
maintain proper volume level to protect your ears.