• There could be ultrasound interference from an environmental source. Click here for information on testing for environmental interference.
  • Try replacing the battery in the stylus pen with a new battery.
  • There may be an ultrasound sensor failure in the Mimio device. Click here for information on testing for a failed ultrasound sensor.
  • If you have another Mimio device available, try calibrating to see if you can isolate the issue to that specific device.