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: Sceptre 43 inches 4K LED TV U438CV-UMC (2015)
Product description: Take in the scenery as 8 million pixels illuminate a world of endless color and stunning detail. Sceptre 4K Ultra High-Definition displays have 4 times the number of pixels as a Full HD display, turning your shows into an epic UHD viewing experience. The unequalled color and clear brilliance of 4k will provide more natural and lifelike images than have ever been viewed on a 43 screen. 4 HDMI ports allow you to connect up to four devices at once, so you can stream, browse, and listen to all of your favorite multimedia. The HDMI 2.0 ports allow you to seamlessly stream 4k video to get the most rewarding viewing experience that is available on the market. Explore your apps on this giant LED screen once you connect your smartphone or tablet to the Mobile High-Definition Link (MHL) port (HDMI 1). The innovative USB port further expands functionality, allowing users to listen to music and view digital pictures quickly and conveniently.
Product feature: 43 Inch True Ultra HD Resolution 3840 x 2160, Motion Estimation and Motion Compensation (MEMC) 120, Mobile High-Definition Link MHL, HDMI 2.0 and HDCP 2.2, 4X HDMI Port & USB Port
Product brand: Sceptre
Target attributes: Resolution
Answer: attribute: resolution
value: 4k ultra high
source: product description
attribute: resolution
value: 4k
source: product title
attribute: resolution
value: 3840 x 2160
source: product feature