I found this on Wikipedia:
Elements[4][5][6][7][8] of the utility belt at times include, but are not limited to, the following:
* Batarangs:[9] A customized throwing weapon used by Batman. Interpretations of the weapon have varied from the boomerang to the shuriken[10]. Recent interpretations have shown a large array of different types and sizes for different effects (i.e. blunt impact, edged, slashing).
* Bat-lasso:[11] Thrown around the feet of Batman's enemies to tie them with a composite-nylon cord. Often causes an escaping opponent to trip. With the push of a button in Batman's glove it can deliver an electric shock.
* Bat-cuffs:[12] Bat shaped handcuffs, resembling the kind used by Special Forces units. These restraints are made of a lightweight diamond-impregnated nylon overlaying a banded steel core. Using a one-piece design, they slide closed and have to be cut off. Batman has given a special tool with a diamond-edged cutting implement to the Gotham PD for removal.
* Bat-monitor
* Bat-Tracer:[13] Used to track enemies Batman can't follow closely.
* Communications device:[14] Often an earbug housed in an ear of Batman's cowl, but sometimes handheld.
* Bat Line: A device that shoots out a steel line in both directions making a zip line. In the 2009 video game Batman: Arkham Asylum it is called the Line Launcher.
* Bat-Darts:[15] Tipped with tranquillizers
* First aid kit:[16][17][18]
* Cryo Capsules:[16][17][18] Small capsules that release a cryonic acid upon the breaking of the shell.
* Bat Goo gun:[19] A handheld foam projector that fires an adhesive-like substance to incapacitate opponents.
* Grapple gun:[20][21][22] Used to fire a bat-shaped hook attached to a high-tensile wire line in order to scale sheer surfaces and/or swing across gaps.
* Night vision bat-goggles:[23] Using Starlite infrared lenses to see thermal output in low light or non-lit situations. Currently built-in to Batman's cowl.
* Batlight: A simple flashlight. Batman uses it in numerous episodes of the animated series, usually when looking for clues, or through private files in the dark. Sometimes replaced by an infrared version that provides illumination viewable only through special eyepieces in Batman's cowl, which allows him to see in the dark without becoming visible himself.
* Flamethower: a miniature flamethower that was used on BatBane in the "Ghosts of Batman arc"
* Kryptonite ring: Stored in a lead box, it is reserved for emergency use against a rogue Superman and/or other Kryptonians.[24]
* Acetylene torch:[25] A strong miniaturized laser used as a cutting tool.
* Line gun: (Grapnel Gun)[26][27][28] Similar to a grappling hook, the line gun uses a strong clamp attached to a high-tensile wire for scaling surfaces and/or traversing gaps. It can be recovered by releasing the clamp and rewinding the cable. It was based from one that is designed as compact climbing gear for commando units.
* Lock pick: Sometimes kept in the gloves instead.
* Marble: Rolled down stairs to imitate footsteps. Depicted as a magnetic metal ball in the "Hush" storyline arc.
* Micro bat-camera[29]: A miniature camera
* Miniature smoke grenades[30]
* Miniaturized toolkit[31]
* Rebreather:[32] Allows Batman to breathe underwater or in vacuum. Depending on the writer and/or artist, it may also be incorporated with the gas mask.
* A Master Bat-Key (sometimes mistakenly called a skeleton key) is perhaps the simplest tool in Batman's utility belt.
* Smoke pellets:[33] Often used to quickly provide cover for Batman's stealthly exits and entries. Knock-out gas pellets are used as well for non-lethally incapacitating opponents. Lachrymatory and regurgitant agents are deployed by throwing or breaking open the small hardened-gelatin spheroid capsules.
* BatStungun/taser, used by Batman to stun his enemies with an electrical shock to temporarily paralize them
* Stun (Flash-Bang) grenades:[34][35] Emits bright light and loud sound to blind and stun enemies.
* Thermite grenades: An incendiary used to burn[36] through obstacles. In Batman: Year One, the thermite charge ignited accidentally and destroyed the utility belt. Although they are identified as Thermite, it is safe to assume that Thermate is used instead. (The former is a World War II technology which has largely been replaced by the latter.) In Judgement on Gotham (1991), Batman is equipped with a phosphor-based incendiary device.
* A cache of cash
* Evidence bags: Bags in which to hold evidence.
* Collapsible sword seen in Batman: The Brave and the Bold, sharp enough to cut through steel objects such as Clock King's robots. Resembles a Lightsaber.
* Bat-Saw used in Batman & Robin to cut through Poison Ivy's vines.
* Bat-Heater mini bat shaped tool used to melt ice.
* Listening devices: Miniature listening devices or 'bugs', sometimes fired from a modified pistol and used to listen in on criminals' conversations. Used in Batman: The Animated Series.
* The Batrope[37] helps Batman slow his descent during rooftop leaps. The Batropes are lightweight and combine the strength of rappelling ropes with the flexibility of a bungee cord. These monofilament de-cel cables tested to 400 lb of support weight. Batarangs are generally thrown to loop around and secure the target[38]. Meanwhile, there's a lanyard attach point[39] in the tail.
And I also found these on the Batman: Yesterday, Today, and Beyond fansite.
I think it's one of those things that sets Batman apart from other superheroes, having a lot of gadgets. Not too much that it seems like he's weighed down with a lot of stuff, but just enough that he always seems prepared.
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