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: HTS 123A2 9Pc Precision Screwdriver & Torx Set
Product description: The precision screwdriver from Hobby Tool Supply is actually 9 screwdrivers in one. The hollow handle allows you to store the bits in the handle and you won't have to go digging in your tool box for the right bit again. Bits (View photo #5 for visual representation): .8mm star bit #0 Phillips 2.6mm spanner 2.3mm triangle T3, T4, T5, T6, T8
Product feature: Chromium vanadium steel bits, Hollow aluminum screwdriver body, Bits are held in place with a magnet, Pocket clip, 9 bits can be stored in the hollow body, Buy 2 get 5% off - Buy 3-9 get 10% off - Buy 10+ get 20% off Enter code HTSCODE2 at checkout. Here's how (restrictions apply)
Product price: $4.88
Product brand: HTS
Target attributes: Voltage
Answer: attribute: voltage
value: None
source: None