Kingstate ,a public Taiwanese company with factories in Dongguan and Suzhou ,China since 1977, dedeicated in design and manufacture sound solutions including: TWS Earphone, Headphone, Personal Sound Amplifier,BT speaker, Buzzer, Micro Speaker, and Microphone. Provide professional OEM/ODM/JDM service with IATF16949/ISO9001/ISO14001 certificated to many global leading companies. Anechoic chamber , Semi-Anechoic chamber, Klippel, Comsol,AP, and Skype, Cortana ,Alexa measurement capability. Product applications for Automotive,Consumer Electronics, Smart Home, Medical, IoT , Safety and Security ,IP Speaker phone and POS...etc.