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: Raspberry Pi Model B+ 512MB Computer Module
Product description: The Raspberry Pi B+ is a single-board computer developed in the UK by the Raspberry Pi Foundation with the intention of stimulating the teaching of basic computer science in schools. Project ideas are only limited by your imagination. Create software, automation, robotics projects and more with the Raspberry Pi.
Product feature: Single-board computer for learning and experimenting, Create robots, games, automation projects and more - possibilities are endless, Boots from micro SD card (not included), 512 MB RAM, Broadcom BCM2835, 700 MHz ARM processor
Product brand: Raspberry Pi
Target attributes: Processor Speed
Answer: attribute: processor speed
value: None
source: None