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: Dewalt DCD771C2 20V MAX Cordless Lithium-Ion 1/2 inch Compact Drill Driver Kit
Product description: 20 volt max Lithium Ion compact drill driver. Lightweight design with high performance motor that delivers 300 unit watts of power out. High speed transmission delivers 2 speeds 0-450 RPMs and 0-1500 RPMs. 1/2 inch single sleeve with ratcheting chuck. Ergonomic handle allows comfort and control. Tools weighs 3.6 pounds. Contains(2) 20 volt max compact Lithium ion battery packs, compact charger and durable contractor bag.
Product feature: Compact, lightweight design fits into tight areas, High performance motor delivers 300 unit watts out (UWO) of power ability completing a wide range of applications, High speed transmission delivers 2 speeds (0-450 & 1,500 rpm) for a range of fastening and drilling applications, 1/2" single sleeve ratcheting chuck provides tight bit gripping strength, Ergonomic handle delivers comfort and control, *Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18. Battery capacity: 1.3 Ah, Compact, lightweight design fits into tight areas, High speed transmission delivers two speeds (0-450 & 1,500 rpm) for a range of fastening and drilling applications, Ergonomic handle delivers comfort and control, High performance motor delivers 300 unit watts out (UWO) of power ability completing a wide range of applications, 1/2" single sleeve ratcheting chuck provides tight bit gripping strength
Product price: $6.71
Product brand: DEWALT
Target attributes: Voltage
Answer: attribute: voltage
value: 20v
source: product title
attribute: voltage
value: 20 volts
source: product feature
attribute: voltage
value: 20 volt
source: product description