Ideal for field use where no electricity is available or when you do not want additional electrical cords cluttering your lab counters. It is portable, lightweight and operated onjust two D size batteries (sold separately). Can be used for over 24 hours of continuous operation and will mix up to 1 liter with a maximum stirring speed of 900 rpm. Made of polypropylene. 9-1/4" x 5" x 3-1/2"H.