Treasure Scope

The Treasure Scope (トレジャースコープ) is an upgrade for Rouge the Bat in Sonic Adventure 2 and Sonic Adventure 2: Battle.

Description
The Treasure Scope is a G.U.N.-made scouting device that Rouge wears on the right side of her head. It has a magenta piece, with writing on it, with an extending green lens that attaches to the upper right side of Rouge's face. The lens itself can be put over Rouge's right eye. When obtained, it allows Rouge to see and interact with invisible items, such as item boxes, rings and Springs. It can be used by selecting it in the action window and the pressing the B button, but will be taken them off whenever Rouge jumps. They are the equivalent to Knuckles the Echidna's Sunglasses.

Location
The Treasure Scope is located in Security Hall. To obtain it, it is required that Rouge possess the Iron Boots and the Mystic Melody.

When beginning the stage, head to the C-Block of the area (on the right) and climb up to the second floor, the "Yellow" floor that is attached to the wall. On this floor you will find an Ancient Shrine where you must play the Mystic Melody. This will make several platforms appear which leads over to the opposite wall, where you will find some iron containers blocking a gap into the wall. Use the Iron Boots to destroy them and head into the gap which leads into a hidden room where the Treasure Scope is located.

Sonic X
The Treasure Scope briefly appeared in the animated television series Sonic X. It appeared in the beginning of the episode "Fly Spy", where Rouge the Bat used it to scout the area where the world's largest diamond, which she planned to steal, was located.

Archie Comics
The Treasure Scope also made an appearance in the Archie Comics' Sonic Universe series, issue #4. In this media it had a slight change in design, where it was given a much larger glass to look through.

The Treasure Scope was used by G.U.N. agent Rouge the Bat on her mission to the Special Zone. This version of it was equipped with a data-scanner and when Feist appeared in front of Rouge and Shadow the Hedgehog, the former used the data-scanner and said that it was going "crazy" because of Feist's power levels.

Trivia

 * The Treasure Scope in the Archie comics could be a reference to the scouter from Dragon Ball Z.
 * In the Dreamcast version of this game, this upgrade was incorrectly called "Sunglasses." This was fixed in the GameCube version.
 * Although it was never stated as such in the comic, Ian Flynn said on his message board that Rouge would be sporting the Treasure Scope in SU: #4.