Paralytic patch

Hey, you have something on your shirt.

A Paralytic patch is a device used to prevent the use of a Transformer's voice modulator.

Fiction

2015 Robots in Disguise cartoon

Strongarm applied a paralytic patch to Steeljaw at Bumblebee's orders as to not let Steeljaw talk his way into confusing them. However, he was shortly able to escape his stasis cuffs and remove it from his body. Enemy of My Enemy