Shenzhen city, yunsei electronics co. Ltd., with a registered address in fukuda street, fukuda city, shenzhen city, at no. 1619, south guangjian building, 3037 shenzhen centre road, shenzhen city. Corporate home: electrons, power management chips, dc-dc pressurized \\/pressure-relief chips, ldo steady-pressure chips, charge management chips, battery protection chips, led drive chips. Thank you for your attention。