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: {Factory Direct Sale} 3AA Aluminium Invisible Blacklight Detection Ink Marker 51LED 51 LED UV Ultra Violet Mini Portable Flashlight Torch Light Lamp
Product description: Aluminium Invisible Blacklight Detection Ink Marker 51 LED UV Ultra Violet Mini Portable Flashlight Torch Light Lamp
Product feature: 51 LED UV Ultra Violet Mini Portable Flashlight Torch Light Lamp
Product price: $10.51
Product brand: Generic
Target attributes: Weight
Answer: attribute: weight
value: None
source: None