Nihon Dempa Kogyo (NDK, 日本電波工業株式会社) is a manufacturer and supplier of crystal products. The company converters crystal units and clock oscillators, high precision oscillators, crystal filters, frequency synthesizers, signal generators, millimeter-wave converter, bio-sensors, outgas analysis systems, etc. Its products are used in IoT, automotive, smartphone, network equipment, personal computer, digital camera, and other applications.