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: Dell Latitude E6430 - 14" - Core i7 3520M - Windows 7 Professional 64-bit - 4 GB RAM - 500 GB HDD -
Product description: Dell Latitude E6430 Laptop with Windows 10 Home Premium from a Microsoft Registered Refurbisher. Intel Core i7-3520M 2.9Ghz Processor (4M Cache, up to 3.60 GHz With Turbo Boost), 8GB DDR3 RAM, 500GB Hard Drive. AC adapter included. This unit comes pre-loaded with a trial version of Microsoft Office 365, Google Chrome, and Avast antivirus. Item is refurbished. May have minor physical flaws but item is in good condition. 30 day warranty on hardware, excluding the battery. Our machines are tested but we can not guaranty length of battery life.
Product feature: 3rd Generation Intel Core i7-3520M 2.9Ghz Processor (4M Cache, up to 3.60 GHz With Turbo Boost), Genuine Windows 7 Professional 64 Bit Operating system., 4GB DDR3 Memory/Wi-Fi, 500GB Hard Drive/DVDR/RW, 14.0" Anti-Glare LED display with built in Webcam, HDMI, Bluetooth, Intel HD4000
Product price: $199.95
Product brand: Latitude
Target attributes: Weight
Answer: attribute: weight
value: None
source: None