srd
SRD
Chime of Interruption: This instrument can be struck once every 10 minutes, and its resonant tone lasts for 3 full minutes.
While the chime is resonating, no spell requiring a verbal component can be cast within a 30-foot radius of it unless the caster can make a Concentration check (DC 15 + the spell’s level).
Moderate evocation; CL 7th; Craft Wondrous Item, shout; Price 16,800 gp;Weight 1 lb.
Open Game Content from the System Reference Document 3.5, used under the Open Game License 1.0a.