The Quha Zono mice have a motion sensor that detects the mouse movements and transforms these movements into cursor motion. The motion sensor is a highly accurate electric component and is affected by ambient temperature among other things. On those very rare occasions when the cursor starts to “drift”, the device can be calibrated by holding the mouse stationary for a few seconds. The easiest way to do this is to place the mouse on a table while it is on. The drifting is then automatically removed in a few seconds.