A mains electricity (AC-powered), electromechanical, device typically used to keep substances, e.g., a liquid, liquids, or a combination of particles suspended in these, in a continual motion in order to prevent sedimentation. This device can achieve this by mechanical movement, by ultrasonic means, or other techniques. For devices used during the tapping of blood from blood donors and devices that mix components in the laboratory see the respective GMDN code.