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: United States Postal Service Ps311 30-Lb Digital Calculating Scale With Usb Pc Connection & Software
Product description: United States Postal Scales Ps30USB/ps311 30-lb Digital USB Postal Scale, Ideal for home business use, the United States Postal Service 30-pound Digital Calculating Scale can be powered via a 9-volt battery, USB connection, or an AC power adapter (not included). With handy USB connectivity, this scale can be used with online postage services. A hinged platform is included for weighing large envelops and mailing tubes, and an easy-to-read LCD display lets you know weighing results. Other features include mechanical overload protection and an auto-off feature after five minutes of non use (for battery operation only). This scale measures from 0.1 ounces to 30 pounds and features +/- 0.1-percent accuracy., What's in the Box Scale and USB cable.
Product feature: 30-lb Large Capacity. This scale does not does not have to be connected to a computer to work, Large 5-digit LCD Display, 3-way Power: USB, Battery Or Adapter, Can Be Used With Online Postage Services, Hinged Platform Allows For Weighing Of Large Envelopes Or Mailing Tubes, 30-pound capacity postage scale, Measures from 0.1 ounces to 30 pounds, Can be powered via a 9-volt battery, USB connection, or AC power adapter (not included), Mechanical overload protection, Can be used with online postage services
Product brand: MOTION MARKETING
Target attributes: Maximum Weight Capacity
Answer: attribute: maximum weight capacity
value: 30-lb
source: product title
attribute: maximum weight capacity
value: 30-lb
source: product feature
attribute: maximum weight capacity
value: 30-pound
source: product feature
attribute: maximum weight capacity
value: 30 pounds
source: product feature