The annual output of switches & connectors is about 260 million pieces. Greetech belongs to Zing Ear Group origin in 1983 and started to run independently in 2007. Now we have about 500 staffs working at about 10, 000 factory buildings. Our main engineers have professional R&D experiences in the lines of switches & connectors for 8 to 20 years. All of our products are safety approved ... https://www.grandye-switch.com