Guangzhou Costok Electronic Technology Co., Ltd is incorporates science, industry and trade into an organic entity. It is a specialized manufacturer that researches, makes and sales the car alarm systems. Costok has its own a great team of highly skillful software, hardware and structural engineers. It is a team that has strong consciousness of professional techniques and marketing in car alarm systems. The development of our company is base on the products that we devise with unique characterstics. We provide OEM/ODM of car alarm systems. Advanced technology and high standard electronic devices are adopted in our manufacture. The quality is our utmost important motto. We have the certification of ISO 9001:2000.