Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Boss Audio 614CA In-Dash CD Receiver with Detachable Face
Product description: The Boss 614C CD Player features a built-in 50 watts power amplifier and a flip-down detachable face.
Product feature: Imp: 32?, Iso Din Mounting, Full Detachable Front Panel, 5V Preamp Output, Active Black Matrix Display
Product brand: BOSS Audio Systems
Target attributes: Screen Size
Answer: attribute: screen size
value: None
source: None