GERMAN MINIFON P55 MINIATURE STEEL WIRE RECORDER AND SPY WRISTWATCH WITH HIDDEN MICROPHONE
K9 Plug-and-play Wireless Lavalier Microphone for Cell Phones
Cold War Espionage & the 1950s Minifon Wire Recorder – historictech
Amazon.com: Elgato Wave:3 - Premium Studio Quality USB Condenser Microphone for Streaming, Podcast, Gaming and Home Office, Free Mixer Software, Sound Effect Plugins, Anti-Distortion, Plug 'n Play, for Mac, PC : Everything