The present invention relates to a disposable auto injector that can be safely operated for automatic injection of a dose of medication and having a housing for accommodation of a syringe with a needle, the syringe being movably positioned in the housing between a first position in which position the needle is accommodated inside the housing and a second position in which position the needle protrudes outside the housing, a mechanical driver anchored to the housing at a first anchor location for applying a force to the syringe thereby moving the syringe from the first position to the second position, and wherein the mechanical driver is also configured for applying a force to the syringe by anchoring the mechanical driver to a different second anchor location.