For continuous use, or intermittent operation using the built-in, infra-red, hand sensor or an accessory footswitch. With adjustable speed from 10 to 100rpm,a timer from 3 seconds to 2 minutes, or continuous setting. Accommodates 90 to 100mm diameter petri dishes (and 150mm dishes using an accessory adapter). Overall 170mm diameter x 75mm high. Weight 1kg. For 230V 50/60Hz single phase supplies.