Instrumental
A weapon with this property can also be used as a basic musical instrument (Armory 105). The size of this instrument’s battery is the same as that of the weapon’s, and it can be used as a weapon (with the charge usage indicated) or an instrument (where it uses 1 charge every 10 minutes). If the weapon is 8th level or higher, it also functions instead as a euphonic musical instrument (Armory 106).
Source