Battery-powered magnetic stirrer offers protable, lightweight stirring power. Ideal for field use or anywhere electricity is not convenient or availalbe. Operates on (2) D batteries that provide approximately 16 days of continuous operation. Mix up to 1L. Speed control knob with separate on/off switch. Operate up to 900 RPM. Constructed of durable, chemical-resistant ppolypropylene. Dimension: 23.5 x 12.7 x 8.9 cm.