Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: IYUEGO Classic Solid Lavender Double Pleated Lining Blackout Curtain Drape With Multi Size Custom 42" W x 84" L (Set Of One Panel)
Product description: TOP CONSTRUCTION GUIDE: For Grommet, the inside diameter of Grommet is 1.6", around 6-8 grommets in a 40 inches wide curtain. The grommet ring is nickel in silver. For Tab top, the height of tab is 4" (10cm). There are about 6-8 tabs in a 40 inch wide curtain. For Rod Pocket, come with 2" header, and the height of pocket is 3" (8cm) to ensure the rod could pass through. For the Double Pleated, there are around 6-8 pleats AND firm plastic hooks in a 40 inches wide curtain. Come with firm plastic hooks. If say the width is 84 inches in the size list, for double pleated, that means the panel width at the top with 6-8 pleats already set in the panel. MEASUREMENT INSTRUCTION: For grommet and tab top curtain, measure the drop from the top of pole to where you want curtain to finish. For Pleated top construction, measure the distance from the eye where the curtain hooks attched to where you want your curtan to finish. For rod pocket, measure the distance from the top of pole to where you want curtain to finish. Top Construction: Double Pleated Features: Blackout Color: As Per Picture Fabric Type: Polyester Crafts: Solid Fabric Weight: 280 gram/square meter ( Heavy) Includes: 1 Panel Care Instruction: Machine Wash, Do not Bleach, Warm Iron
Product feature: Polyester & Polyester Blend, Imported, Thermal Insulated Blackout Lined curtain, Blocks out 98% of light and 100% of UV ray.Features Innovative Triple Weaved Fabric Construction Allowing for Single Layer, Each Curtain is Handmade by Professional Tailor, Color May Vary Slightly From Depiction Because Of Lighting, Monitor And Dyelot Chromatism., Sold As One Panel, Please Order More Quantity To Cover Your Rod Or Track. Suggest Buy The Complete Set 2 Panels At Same Time, Avoid Dyelot Chromatism, Curtains Come With Extra Fullness, Pleats are Fixed By Factory, We Send Curtain With Plastic Hooks,, All Curtains are Customized for Any Size Except Amazon Prime, Curtain is Sold as Pleated Top, We Can Change it to Grommet Top, Rod Pocket Top and Tab Top for Free, 3-6 production time for Custom Curtain. If you want customize, please send us email by amazon.
Product price: $57.99
Product brand: IYUEGO
Target attributes: Light Allowance
Answer: attribute: light allowance
value: blackout
source: product feature
attribute: light allowance
value: blackout
source: product title
attribute: light allowance
value: blackout
source: product description