(b) ‘Nano Plug’ refers to the world’s smallest hearing aid. The designing of this nano plug hearing aid was supported through Indiegogo, which is a crowd-funding platform. This hearing aid includes a rechargeable nano battery along with micro components.The development of the nano plug hearing aid was made possible by nanotechnology,most particularly by the US Photonics Endure nano battery that is very small in size like a grain of sand and it gives one-week backup.