Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Vanguard Endeavor ED 8x42 Binocular with Harness + Tripod Adaptor + Lens Pen ...
Product description: Premium Lifetime Warranty Extra low-Dispersion (ED) glass BaK4 roof prisms Waterproof/Fogproof Anti-Reflection coating
Product feature: Premium Lifetime Warranty, Extra low-Dispersion (ED) glass, BaK4 roof prisms, Waterproof/Fogproof, Anti-Reflection coating
Product brand: Vanguard
Target attributes: Prism Design
Answer: attribute: prism design
value: roof prisms
source: product feature
attribute: prism design
value: roof prisms
source: product description