Ducati Multistrada MTS 1200S D-Air Owner's Manual page 176

"Low" battery level of Hands Free (HF) key
The activation of this "warning" indicates that the
Hands Free system has detected that the battery that
permits the active key to communicate and turn the
vehicle on is almost discharged.
Note
In this case, Ducati recommends changing
battery in the shortest delay.
To change battery, refer to paragraph "Replacing the
battery in the active key" page 286.
Fig. 76
175