One battery. Bug could be turned on/off from it's remote control receiver. Receiver for the Watergate Bug could pick up audio for several miles. Attachment to the receiver had two buttons on the unit that would turn the bug on/off. The bug would turn off when bug sweep for eavesdropping was detected... Spy vs Spy.
Disclaimer: Mark Twain (1835-1910-To be continued) is unlicensed. His river pilot's license went delinquent in 1862. Caution advised. Daily Paul ☑
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