Abstract: The invention provides a handheld device for training a user in operating an auto-injector. The device has a screen and a sensor which can quantify a physical activity of the device. A visual representation of the auto-injector and a visual instruction for a desired use of the auto-injector are presented on the screen while the user is requested to manipulate the handheld device as if it was the auto-injector. By use of the sensor date, the device evaluates the performance of the user and determines a level of compliance with the instructions. Accordingly, the invention provides an increased safety in the use of auto-injectors e.g. for epinephrine (adrenaline).