[Smedley]

For a transmitter, no matter the size, that's a hell of a battery!

There is no battery needed. Some RFID systems use magnetic or electromagnetic signals as their power source.

[longtermmemmory]

Ok so if I pop it in the microwave will it defeat the transmitter? How does one electronically sterilize the offending garments? Will the materials be included in shaving cream itself? Are the manufacturers obligated to disclose the use of the devices?

Would a tinfoil lined shopping bag defeat security tracking?