Tehran: An Iranian scientist has claimed to have built the world`s tiniest microphone that could be used to build "invisible" hearing aids, the ISNA news agency reported.
Bahram Azizollah Ganji of Noshirvani University in the northern city of Babol, who built the 0.5 mm X 0.5 mm microphone, said he would apply for the world record.
The device could be used for medical purposes to receive the exact sound of the heart for diagnosis of heart problems and examination of foetus` health.
It can also be used for fishing and surveillance systems under water to measure sound waves and ultrasound waves that would help identify marine animals, he said.
The tiny microphone can be used for telecommunication systems, information collection devices and defence systems.
The microphone that cannot be seen with the naked eye has a high sensitivity and low cost. Low power consumption is another advantage of the device.