There should be no issue with most modern hearing aids. Previous issues in the 80s-90s resulted from improper hearing aid designs. A NEMA-sponsored study, conducted by David F. Henry, PhD and Barak Dar, "Effects of Ultrasonic Sensors on Hearing Aids" (February 2006), concluded: "After assessing 23 hearing aids representing the digital products of all major hearing aid manufacturers, just two hearing instruments were severely affected by ultrasonic occupancy sensor devices. One device, the ImpaCt DSR675 manufactured by AVR Son ovation, has not been in production for over four years. Newer hearing instruments from this manufacturer have exhibited no interference when exposed to the ultrasonic occupancy sensor signals. The second device, the Bravo, manufactured by Wide, is still in production. However, the manufacturer reports that they have developed a modification that can be made to the instrument that greatly reduces the susceptibility of the instrument to ultrasonic occupancy sensor signals."