Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Portable Multi-plug Socket Style 7-Port USB 3.0 Hub w/ Switches - Black
Product description: This7-Port Super Speed USB 3.0 Hub has rather convenient and efficient service efficiency. It is plug-and-play designed with 7 individual control swithches to provide independent overload protection for each USB port.Electric current of the port reaches up to 900mA. Hightransmissionspeed 5Gbps. For more inforation please contact seller
Product feature: In multi-plug socket style, Super speed transmission, 7 USB 3.0 ports, Supports USB 3.0 standard, speed up to 5Gbps, Plug and play, supports hot plugging
Product brand: MamaDooo
Target attributes: Number of Ports
Answer: attribute: number of ports
value: 7-port
source: product title
attribute: number of ports
value: this7-port
source: product description