"All historians agree that George Washington's greatest regret was not being PERMANENTLY INVISIBLE. Now you can succeed where the man who invented America failed. Be invisible forever with the Cloak and Dagger Spy Watch!"
There's something cool about wrists and devices on them. Wristwatches are cool. Wristwatches that call your special friend are even cooler.
In fiction, a bracelet is never just a bracelet and a watch never just tells time. They serve some sort of function. Sometimes, multiple functions. They unlock doors, teleport you places, and create miniature harpoons. They're the super Swiss army knife of wrist wear.
Oh, and sometimes they even tell the time.
Often a result of Where Does He Get All Those Wonderful Toys?. Can be used as part of a Nonuniform Uniform. A subtrope of Shoe Phone. See also Magical Accessory for other tricked out trinkets.
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Anime and Manga
Light Yagami hides a piece of his Death Note inside his watch, meaning he can kill anyone at any time.
Tower of God: The pockets, which are universal translators, watches, timers, contract makers and telephones. Plus they float around and can turn invisible.
Giant Robo: Daisaku controls the eponymous giant robot with one.
Youji from Weiß Kreuz hides his garrote wire inside his already cool-looking diver's watch.
Ed's pocketwatch in Fullmetal Alchemist is a badge of rank, noting his position as a State Alchemist. These watches allegedly serve as an alchemical amplifier somehow, but this is never really shown. It is mainly used as an ID to access government resources, including a massive expense account.
Jimmy Olsen in Superman has his Signal Watch, which tells the time and gives off a high-pitched frequency that Superman can hear. Originally, it was a present from Superman to Olsen; Post-Crisis, Olsen invented it himself, and Superman sometimes finds it a nuisance.
James Bond and other spies use these types of wristwatches all the time. At least for Bond, it becomes something of an AssPull, since it just so happens to do whatever he needs it for at that moment, be it a buzzsaw to cut ropes, a laser to cut steel, an electromagnet to fetch keys, and so on.
To the point that in GoldenEye, when Bond uses his lazer watch to cut his way out of a railway car, there was no previous scene of him getting from Q Branch; to the average audience, of course he would have such a gadget on him. Furthermore, the villain (an ex-MI6 agent himself) took away his watch because he knew it was a gadget of some kind.
Our Man Flint. Derek Flint's watch could wake him up out of suspended animation and act as a microscope.
Undercover Brother. Smart Brother gave the title character a watch that could spritz hot sauce on white people's food to make it edible.
In Kim Newman's Diogenes Club stories, it's strongly implied that there's something interesting about Charles Beauregard's pocket watch "with the intricate crystal workings". The Undertaking refuse to let him into their HQ while carrying it, and he certainly refuses to let them look after it while he's there. Sadly, the glossary page explaining what it does has been censored by the current Diogenes chairperson.
In The Girl, the Gold Watch and Everything by John D. MacDonald, the hero inherits a gold pocket watch that stops time for everyone but the person holding it.
The Girl, the Gold Watch and Everything was homaged in Lady Slings the Booze (part of the Callahans Crosstime Saloon series) where one of the bad guys has a time stop device built into a fancy gold wristwatch. Author Spider Robinson acknowledged the Shout-Out to John D. MacDonald in the introduction.
Also homaged (without credit) in the DuckTales episode "Time Teasers."
The Doctor Who Expanded Universe novel Borrowed Time has a similar idea, with a twist. The people Mr Symmington and Mr Blenkinsop give their wristwatches to are literally borrowing the time, and will be expected to pay it back. With compound interest.
Live Action TV
The teleport bracelets from Blake's 7. Apparently they had to be regularly replaced because the cast and crew kept stealing them as presents for their kids.
Doctor Who got there first, with the teleport-wristwatches featured in The Keys of Marinus (like Blake's 7, written by Terry Nation). The Seventh Doctor had a pocketwatch scanner, which he used in Survival; possibly in other stories as well. The Chameleon Arch pocketwatch in "Human Nature"/"The Family of Blood" and "Utopia" DEFINITELY counts as a gadget-watch. It holds the memories and Time Lord nature of a Time Lord who's going so deep cover he gives himself false memories and even reads genetically as a human or member of any other target species.
Vortex manipulators (wriststrap teleport/time machines used by Time Agents and River) might also fall under this; one would assume a time machine can tell the time.
Chuck has a "government issue watch" that can be used to trace him. He's also seen talking into it as a way of communication.
In Mighty Morphin' Power Rangers Zordon kept in touch with the Rangers via a wristwatch-like device. It could also tap into the Command Center's teleportation system (which Billy got it to do accidentally!)
Many other Power Rangers teams have had their morphers wrist-mounted. They're generally being phased out in favor of handheld Cellphone-style morphers.
One of Kamen Rider Double's Memory Gadgets is the Spider Shock, a wristwatch that can turn into a spider robot; it typically functions as a "smart" grappling hook, but can also be used in conjunction with Double's weapons to make "nets".
Jarrod and Brandi found spy equipment in a storage locker in Storage Wars, and among them was one of these, which doubled as a video camera, and could be connected to a computer with a USB cable.
Dick Tracy and his radio wrist watch is one of the earliest examples of this, having been conceived way back in the 1940s when actual radios still had vacuum tubes. More importantly, Tracy's has received upgraded versions with additional functions over the years to keep it up to date.
Dragon magazine #130 had an article with 17 special watches for use in Top Secret.
The COMP terminals from certain games in the Shin Megami Tensei series serve various functions. In all games, they contain a Demon Summoning Program used to call demons that you have contracts with. In IMAGINE Online, it also holds the Demonic Compendium and the chat program as well. Certain hacked COMPs serve as dungeons, and some special COMPs can style your hair!
In the Phoenix Wright: Ace Attorney series, Matt Engarde has a bracelet that works as a cell phone, and Apollo in Apollo Justice: Ace Attorney has a special one that can tell him whenever someone around is feeling a strong emotion, so he use the Perceive System to find tells in his witnesses.
In Absolute Obedience, the Russian spy Zhores Barsoukova appeared to have one of these. It turned out to be a completely ordinary watch, and a decoy from a less compromised spy.
The Spy from Team Fortress 2 has three different watches, each equipped with a slightly different type of cloaking device.
However, one of them is a pocket watch instead of a wristwatch.
The PokéGear, introduced in Pokémon Gold and Silver, was a wrist-worn multi-function device (watch, map, phone, and radio). After skipping it in Pokémon Ruby and Sapphire, which had the hand-held but not wrist-worn PokéNav, the concept returned in Pokémon Diamond and Pearl with the appropriately-named Pokétch (Pokemon Watch) in the main series and a new PokéGear for the Gen 2 remakes.
In Secret Agent Barbie, a watch is used by Barbie to communicate with her friends back at base while she’s on a mission. When it’s not being used in this way, it functions as a minimap/GPS type thing.
And recently, Tedd has entered the business of making wand-watches, allowing people to use their inherent magical energy to cast spells they couldn't cast otherwise (as long as they know exactly what the watch does and how it does it). Of course, since they're toy watches imbued with magic, they can't tell time.
Bob from Reboot has Glitch, which literally does anything he wants it to do, even if he doesn't know the exact tool he needs.
The Tracy Brothers in Thunderbirds communicated with each other using these.
Brock, Rusty, and the eponymous brothers in The Venture Bros. have watches that act as video communicators, as well as contain GPS trackers so they can find each other. Rusty's bother JJ uses a device concealed in his collar instead, pointing out that watches are impractical, since in the event of being captured, the villain will almost certainly bind your hands.
Inspector Gadget's entire hand functions as a gadget watch (among other things). His niece Penny has a more standard Videophone/ Remote watch, however.
Parodied in Sheep in the Big City when Sheep is recruited by a spy organization and receives a watch...that can tell the date. When the enemy Mooks look at it, they scream "He has a watch that tells the date! ABORT MISSION!" and start evacuating en masse before the Angry Scientist shows up and says it isn't dangerous.
Scrooge's nephews had one (and caused predictable chaos with it, and allowed villains to steal it, etc.) in the DuckTales episode "Time Teasers".
Secret Squirrel has a watch that when opens up has a squirt gun that douses the fuse of the missile to which he's tied in his show's opening titles.
Real spies used at least two different models of gadget watches: one was a pretty obvious photographic camera, the other had a hidden microphone designed to be used with an external recording device.
Viktor Suvorov described how during his training he used a watch with a microphone. Apparently, using it during a dinner was a mistake - all the clinking of the cutlery made the speech difficult to hear.
A bit of Fridge Logic kicks in as the commercial features a little-known wrist communicator from Star Trek: The Motion Picture instead of the iconic flip-top-style communicator. Why? Because the classic communicator design has been so thoroughly defictionalized that it's already (in the era of smartphones) become outdated. (Also of course because wrist-mounted communication is the whole point of the exercise.)