It is a shield that is magically encased within a watch. When the button on the side of the watch is pressed, a full shield spirals outward, resembling a camera shutter. When expanded, the strap of the wristwatch becomes a leather brace that wraps around the user's forearm. The shield is polished bronze, has the width of four feet, and inside of the shield is coated in a soft leather. It has a series of engravings on it depicting the events that took place during the The Sea of Monsters. The pictures include Annabeth slaying a Laistrygonian Giant disguised as a dodgeball player, Percy fighting the bronze bulls on Half-Blood Hill, Tyson riding Rainbow toward the Princess Andromeda, the CSS Birmingham blasting its cannons at Charybdis, and Tyson battling the Hydra, as he held aloft a box of Monster Doughuts.
At the beginning of the second Chariot Race, Tyson gives Percy a wristwatch and tells him to press the stopwatch button when he needs it. When the Hephaestus Cabin's chariot attacks Percy, he pressed the button and the shield opens up to defend Percy and Annabeth, destroying Beckendorf's sword in the process, much to Beckondorf's dismay.
Percy brings the shield out to defend himself from Dr. Thorn, whose projectiles managed to create a huge dent in it. Percy later contacts Tyson to tell him that it was damaged, and Tyson offers to fix it for him.
When Percy enters the Poseidon's Cabin, Tyson is already there and presents it back to him along with a herd of mini bronze hippocampi on the ceiling. It was unfortunately lost in the Labyrinth when Percy hurls it at a Kampê, to allow Tyson to escape.
|Personal Weapons:||Riptide | Annabeth's Knife | Backbiter | Frank's Spear | Hazel's Spatha | Katoptris | Nico's Sword | Thalia's Spear | Aegis | Maimer | Kronos' Scythe | Ivlivs | Master Bolt | Poseidon's Trident | Sword of Hades | Reyna's Spear | Hades' Staff | Juno's Gladius|
|Magical Items:||Annabeth's Yankees Cap | Helm of Darkness | Keys of Hades | Flying Chariot | Golden Apple | Greek Fire | Hermes' Multivitamins | Leo's Magical Toolbelt | Nectar and Ambrosia | Pandora's Pithos | Winged Shoes | The Golden Fleece | Stygian Ice Whistle|
|Spoils of War:||The Minotaur's Horn | Medusa's Head | Kampê's Scimitars | Nemean Lion's Pelt | Gorgon Blood | Cornucopia|
|Items:||Camp Necklace | Chameleon Armor | Daedalus' Laptop | Golden Drachma | Mark of Athena | The Pax | Video Shield | Wristwatch Shield | Golden Mango | Sibylline Books|
|Blessed Metals:||Celestial Bronze | Imperial Gold | Stygian Iron|