An autoinjector includes a body (10, 12), a syringe (13) or cartridge disposed within the body, and a plunger (60) moveable during operation between a first and a second position to effect an injection, the plunger including a transverse passage (66) containing a moveable magnetic element (68) of a magnetic pair, the body including another magnetic element (54) at a position such that, on the plunger reaching and/or nearing its second position, the magnetic attraction therebetween causes a sound-emitting impact, the plunger (60) including a magnetic keeper element (72) mounted adjacent the transverse passage and adapted to hold the movable magnetic element (68) against movement until attraction by the other magnetic pair element (54), wherein the keeper element (72) is disposed on the longitudinal axis.
