Top top has yellowed.  While most plastic parts are white, over time, a compound in the plastic called bromine rises to the surface and reacts with UV light, causing a yellowish discoloration. This is a common phenomenon . The Brother ADS-2700W Wireless High-Speed Document Scanner is a versatile sheetfed scanner with a maximum resolution of 1200 x 1200 DPI. It features an 8-bit grayscale depth and 48-bit color depth for high-quality scanning. With connectivity options including wireless, Ethernet, and USB 2.0, this scanner offers flexibility for various devices. The duplex feature allows for scanning both sides of documents in a single pass, making it a convenient and efficient scanning solution for A4-sized documents. Buyer adds usps shipping