I developed a customized Offline POS System to help retailers and wholesalers manage receipts, transactions, and sales data efficiently without needing an internet connection. The project started when a wholesale client needed a POS slip generator to track sales based on product quantities and prices. I built a solution tailored to their needs, and after successful implementation, I sold the same solution to four more clients, customizing it for both retail and wholesale businesses. Key Features: Digital Receipt Generation: Create sales slips with unique slip numbers and batch management. Product Management: Track product details for retailers (names) and wholesalers (quantities & pricing). Offline Storage: Use SQLite for data storage, allowing the app to work offline. Thermal Printer Integration: Print receipts via Bluetooth. Sales Dashboard & Analytics: Real-time overview of sales performance (daily, monthly, yearly). Smart Search & Sales History: Find past slips by customer, slip number, or date range. Auto-Print & Data Export: Auto-print receipts and export data for analysis. Shop Customization: Personalize with your shop's name, address, and contact info. Large Dataset Support: Efficiently manage millions of slips with pagination. The app has been running smoothly for four months with zero issues and positive client feedback. This solution streamlines sales processes, improves transaction records, and enhances overall efficiency for businesses.