The “Bajaj Shield Series Specter 55 (480139)” refers to a Bajaj brand air cooler, specifically a 55-liter capacity model, part of their Shield Series, with “Specter” likely denoting a design or feature, and 480139 being the model or product code, found listed on electronics retailer sites like Modern Computer Bhopal. It’s a home appliance for cooling, fitting into the larger Bajaj Electricals range of air coolers known for affordability and quality.