July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Installation Procedure

Install the battery with the positive (+) side down.

Fig 1: Installing Transmitter Battery
Courtesy of GENERAL MOTORS CORP.

Use one 3 volt, type CR2032 battery, or the equivalent.
Ensure that the seal is in position.
Align the two halves of the case together and squeeze the case closed until the tabs are fully seated.