A vehicle antitheft device comprises a known circuit block (1) for operating an audible or visual alarm (15) when the vehicle suffers a break-in attempt. The antitheft device comprises, associated. with said circuit block (1), means (36) for generating a coded radio signal when the break-in attempt takes place, said radio signal being remotely received by receiver means (30) associated with a portable member (3) comprising an electrical circuit in which audible and/or visual signalling means (41, 43) are provided to warn of said break-in attempt.;A device (9) associated with the circuit block (1) of the antitheft device is provided to activate said circuit block (1) if the vehicle is removed from its parked position.
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