ULN2004A DIP 16 ST MICRO About US Supply chain management services; sales of electronic products; wholesale of electronic components; retail of electronic components; internet sales (excluding goods requiring a license); 3D printing services; information consulting services (excluding licensed information consulting services); information technology consulting services; manufacturing of electronic components; manufacturing of integrated circuit chips and products; integrated circuit chip design and services; integrated circuit design; sales of integrated circuits; repair of instruments and meters; sales of instruments and meters. (Except for projects that require approval by law, business activities may be carried out independently in accordance with the law based on the business license.) Category II value-added telecommunications services. (For projects that require approval by law, business activities may only be carried out after approval by relevant departments, and the specific business items shall be subject to the approval documents or licenses issued by relevant departments.)