Spy Shoe with a Heel Transmitter

It looks like something out of an old spy movie, but this shoe issued by the KGB is a reminder of the realities that took place during the Cold War, and the many technical innovations that arose because of espionage. Agents used the shoe’s transmitter to record and monitor top-secret conversations. Batteries and a microphone were installed in the heel of the target’s shoes, making them a walking radio station to nearby listeners.