Educational software development; specialized teaching instruments, educational models and teaching aids, experimental analysis equipment, audio-visual recording and playback devices, stationery, musical instruments, crafts, furniture, toys, plastic products, lighting fixtures, sports equipment and accessories, kitchen utensils manufacturing and sales; design, installation, and maintenance of educational facilities and laboratory equipment; building decoration; power system installation services; building equipment automation system engineering, communication system engineering, security surveillance and anti-theft alarm system engineering, computer network system engineering services; outdoor sports facility construction; sports venue and sports field facility management services