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: Intel Core i7-620M SLBPD SLBTQ Mobile CPU Processor Socket G1 PGA988 2.66Ghz 4MB 2.5 GT/s
Product description: Intel Core i7-620M Mobile Laptop CPU Processor Dual-Core 2.66GHz SLBTQ
Product feature: Intel Core i7-620M Mobile Laptop CPU Processor Dual-Core 2.66GHz SLBTQ, Intel Core i7-620M Mobile Laptop CPU Processor Dual-Core 2.66GHz SLBTQ
Product price: $49.97
Product brand: Intel
Target attributes: TDP
Answer: attribute: tdp
value: None
source: None