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: Unnecto Neo - Factory Unlocked Phone - Retail Packaging (Gray)
Product description: Enjoy a great smartphone experience with the Neo, powered by Android version 4.4.2 Kit Kat. This phone offers 4 GB internal memory, Expandable to 32GB, 512 MB RAM, 8 MP back camera, 3 MP front camera, LED Flash, auto focus, Internet and Wi-Fi capable. We work hard to ensure that our products meet the highest standards that our customers have come to expect from the Unnecto brand. But as we all know, "stuff happens" and that is why all Unnecto devices have a great One Year Limited Warranty.
Product feature: Unlocked Dual SIM Phone, Quad Core 1.2 GHz Processor, 8MP Main Camera, 3 MP Front camera, 5.0" WVGA IPS LCD Capacitive Touch screen, 3.5 mm Audio Jack, FM Radio, MP3 Player, MP4 Player Micro SD Slot up to 32GB Android 4.4.2 Kit Kat, 4G HSPA + 21Mbps GSM 850/900/1800/1900 HSDPA 850 / 1900 Nationwide AT&T: Cricket Wireless, Tracfone, Straight Talk, Net 10, H20 Wireless, 420 Wireless, Black Wireless, Consumer Cellular, Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.
Product brand: Unnecto
Target attributes: Operating System
Answer: attribute: operating system
value: android
source: product description
attribute: operating system
value: android
source: product feature