In an injection device a rotary indicator sleeve 20 indexes angularlybetween a pre-firing position and an injection complete position to create a visual and audible or tactile signal as the drive plunger 28 arrives at or near its fired position. The indicator has a saw tooth profile which co-operates with respective abutments 34, 40 on the plunger and a housing part of the device to control and energise indicator movement. The indicator sleeve is biased rearwardly by a compression spring 46； upon completion of the injection, the rising edges of its saw tooth profile impact on surfaces 38 of an inner body housing 22 creating the audible signal. At the same time, a coloured portion of the sleeve is visible through a window 18 in the outer cover 14.
