Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: USB C Hub, CHOETECH USB-C to 4-Port USB 3.0 Hub for USB Type-C Devices Including the new Macbook 12 Inch ChromeBook Pixel and More (Silver Aluminum)
Product description: CHOETECH USB-C to 4-Port USB 3.0 Hub Works with the latest computers and smart devices with USB-C ports. Sleek & Slim Design to Meet Your Life Style Solid aluminum bodywith Ultra Slim design perfectly match to your Apple New Macbook 12 Inch, Google ChromeBook Pixel Extra Ports Turn one USB-C port into four USB 3.0 ports. Super Fast Data Transferring Speed Transfer data at speeds of up to 5 Gbps through four ports, 10 times faster than USB2.0, spending less time syncing. Compatible Devices: - 2015 MacBook with 12" Retina Display (NOT 2015 MacBook Pro) - 2015 Google Chromebook Pixel - Lenovo Yoga 900 (13 Inch) - New Dell XPS 13 9350 Supported Systems: - Mac (OS X 10.2 and above) - Windows (8 / 7 / Vista / XP) - Linux Certificate: CE certified & FCC certified & RoHS compliant Warranty: Fan-favorite 18-month warranty and friendly customer service Please Note: Wireless network adapter, receiver, bluetooth adapter that can only work with their motherboard USB HOST may not be compatible with a third-party USB C hub. Mac OS may not work with any USB HUB unless latest update applied, please apply the latest update for MAC OS from Apple.
Product feature: Sleek aluminum body with Ultra Slim design perfectly match to your Apple New Macbook 12 Inch, Google ChromeBook Pixel, Super Fast Data Transferring Speed: Up to 5 Gbps data speeds, 10 times faster than USB2.0, spending less time syncing, USB C Hub: Compatible with the latest computers and smart devices with USB-C ports, Extra Ports: Turn one USB-C port into four USB 3.0 ports, What You Get: CHOETECH USB-C to 4-Port Hub, 3.3ft detachable USB 3.0 cable, Our Fan-Favorite 18-Month Warranty and Friendly Customer Service
Product brand: CHOETECH
Target attributes: Number of Ports
Answer: attribute: number of ports
value: four usb 3.0 ports
source: product description
attribute: number of ports
value: 4-port
source: product feature
attribute: number of ports
value: four ports
source: product description
attribute: number of ports
value: four usb 3.0 ports
source: product feature
attribute: number of ports
value: 4-port
source: product title
attribute: number of ports
value: 4-port
source: product description