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: Sunbeam Full Heated Mattress Pad
Product description: 100% Polyester. Soft and lightweight for all season comfort. One Control. Size: Full (54" x 75")
Product feature: Thermofine Warming System senses and adjusts to deliver consistent warmth., EasySet Control - 10 Warming Settings provide personalized comfort., Soft and lightweight for all season comfort., Fits Mattresses up to 15" deep., Machine Wash and Dry.
Product brand: Sunbeam
Target attributes: Size
Answer: attribute: size
value: full
source: product title
attribute: size
value: full
source: product description