Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Acer Intel Celeron J1900 2GHz Desktop PC - AXC-603G-UW30 (Certified Refurbished)
Product description: Maximize your creativity and your desk space, too. The Aspire XC Series Desktop is just one-third the size of a tower PC but provides multitasking performance for fun and work, while exhibiting progressive style. Space saving and easy to set up, this desktop offers plenty of power for your multimedia creativity and HD entertainment and your media is shareable in AcerCloud., Amazon Renewed is your trusted destination for pre-owned and refurbished products that are inspected and tested to work and look like new. A Renewed supplier who is Amazon-qualified and performance managed, performs a full diagnostic test, replaces any defective parts, and thoroughly cleans the product. The products will have minimal to no signs of wear, no visible cosmetic imperfections when held 12 inches away, and may arrive in a brown or white box with relevant accessories that may be generic., This product comes with a minimum 90-day supplier-backed warranty An Amazon qualified supplier will provide a replacement or refund within 90 days of your receipt if the product does not work as expected. The warranty is in addition to Amazon's standard return policy. Learn more, Shop for smartphones, computers, laptops, tablets, home and kitchen appliances, game consoles, office products, and more on Amazon Renewed .
Product feature: This Certified Refurbished product is manufacturer refurbished, shows limited or no wear, and includes all original accessories plus a 90-day warranty, Processor Type: Intel Celeron J1900, Processor Speed: 2GHz, Processor Core: Quad-core, Cache: 2MB
Product brand: Acer
Target attributes: Processor Speed
Answer: attribute: processor speed
value: 2ghz
source: product title
attribute: processor speed
value: 2ghz
source: product feature