I reported a failure of this device earlier this week.The dr reset the device and it has failed again.My daughter has a medtronic strata vp shunt in her brain.The device is only supposed to change performance level after adjustment with a medical magnet tool.The device has randomly changed its setting twice now in about a week.The only remedy to this situation is brain surgery to remove the defective valve and replace it.Not doing so could result in severe injury or death.