Wrist Communicator T-37
Seen in Episode #2: "Diplomat's Daughter"
Kind of device Communicator
Organization CONTROL
Used by Maxwell Smart

As it's name implies, a communicator worn on the wrist [Episode #2: "Diplomat's Daughter"]. Also called a watch phone [Episode #19: "Back to the Old Drawing Board"].

An earpiece must be attached before use for two-way conversation but can be used without if transmitting only.

Supplied by Professor Carleton [Episode #2: "Diplomat's Daughter" and destroyed by Hymie [Episode #19: "Back to the Old Drawing Board"; also seen in Episode #12: "My Nephew the Spy"; and Episode #3: "School Days" without earpiece].