AEI PROTECT-ON SYSTEMS LTD, (nicknamed APO or AEI by most customers) is a Hong Kong based company and has been specialized in the development, manufacturing, and marketing of high-quality Security Systems since 1979.The manufacturing of security systems is our major business. The product lines include Digital Access Control Keypads, Intruder & Burglar Alarm Control Panels, Security Auto Dialers, Electric Door Locks, PIR Motion Sensors and Alarm Accessories. They are under the brand names of APO or AEI.We have a strong product development team of talented staff, which includes the software and hardware electronic engineers, mechanical engineers, and art designers. All our projects starting from product proposal brainstorming to the final products in production are done fully in house.We promise a very competitive position in pricing and product selections in the security product industry. Also, we always undertake our most endeavors to provide good service to the customers' satisfaction.The Pet and Animal training device Division is also a busy player in our company. Please click the Pet Products section on our website for these interesting and lovely products.