32-Pc MVPA Accelerometer Class Pack. Includes 32 accelerometers and 32 unit capacity carrying case. Steps, distance, calories, exercise time, MVPA, clock, speed, seven days memory, piezoelectric motor, clam shell, alligator clip, loss prevention strap, user changeable battery and automatic shut-off when inactive to save battery life. No moving parts and no clicking sound. Tests more accurate than spring-levered and spring-activated pedometers. Keeps its accuracy even when tilted.