The Defibrillator and other gadgets in Battlefield 3 are in-game equipment for the Assault and Support classes. They cannot be used in real life.
| Class | Gadget | Unlock Rank | Function |
|---|---|---|---|
| Assault | Medkit | Rank 1 | Throw to heal self/teammates (recharges). |
| Defibrillator | Rank 4 | Revive dead teammates (100% health). Charge for 100% → 200% (overheal). | |
| M320 Smoke / HE / LVG | Rank 7 / 10 / 13 | Underslung grenade launcher variants. | |
| M26 MASS / Dart / Frag / Smoke | Rank 16 / 19 / 22 / 25 | Underslung shotgun / less-lethal. | |
| Support | Ammo Bag | Rank 1 | Resupply ammo/gadgets to teammates. |
| C4 | Rank 4 | Place 3. Detonate remotely. Destroys tanks. | |
| Claymore | Rank 7 | Tripwire mine. Laser trigger. | |
| Mortar / Airburst | Rank 10 / 13 | Indirect fire. Airburst = proxy fuse. | |
| Recon | MAV / T-UGS | Rank 4 / 7 | Micro Air Vehicle (fly/cam) / Tactical Unattended Ground Sensor (motion spot). |
| SOFLAM | Rank 10 | Laser designator for Javelin/guided shells. | |
| Engineer | Repair Tool / EOD Bot / Mine | Rank 1 / 4 / 7 | Repair vehicles / remote repair / AT mine. |
Gadgets define class roles. Master them. That's the Battlefield way.