Abstract: Disclosed is a fire-fighting device, which includes a casing that delimits an inner cavity in which at least one dispersible fire-extinguishing agent is deposited, and pyrotechnics suitable for generating an explosion causing the casing to rupture and the fire-extinguishing agent to be dispersed. The pyrotechnics include at least one explosive charge, generating the explosion, and a detonator for triggering the explosion of the at least one explosive charge. The detonator includes an ignition device designed to trigger, when in an active state, the explosion of the at least one explosive charge, and an impact sensor designed to detect a mechanical impact received by the device and to bring the ignition device to the active state upon detection of the mechanical impact.