Actical Z-Series Physical Activity Monitors provide an objective, quantifiable measure of Physical Activity and Energy (Caloric) Expenditure for your research. Now with 32MB of on board memory, and high speed sampling capabilities, the Actical system makes monitoring physical activity for days or weeks a practical reality. Powerful, fast, and flexible, Actical helps you collect valuable physical activity and energy expenditure data simply and reliably. The Actical physical activity monitoring system is a rigorous solution designed with the needs of serious researchers in mind