Quha Zono and Zono 2 have a built in energy saving feature. Normally Quha Zono or Zono 2 responds immediately to any movement by the user. When the mouse has been stationary for about 10 seconds, it automatically starts saving energy to maintain maximum usage time. When the user moves the mouse again, the mouse automatically resumes standard operation. There may be a small delay in the cursor movement when this happens.