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: Samsung Galaxy S5 mini Duos G800H/DS 16GB Dual SIM Unlocked GSM Smartphone - International Version, No Warranty (Electric Blue)
Product description: GSM Samsung G800H/DS Galaxy S5 Mini DUOS - Charcoal Black. Android OS, v 4.4.2 (Kit Kat) CPU: Quad-core 1.4 GHz Sensors: Accelerometer, gyro, proximity, compass, heart rate Messaging: SMS(threaded view), MMS, Email, Push Mail, IM, RSS Browser: HTML5 GPS: Yes, with A-GPS, GLONAS Java: Yes, via Java MIDP emulator
Product feature: 2G Network, GSM 850 / 900 / 1800 / 1900 3G Network, HSDPA 850 / 900 / 1900 / 2100 SIM: Micro-SIM Fingerprint sensor (PayPal certified) IP67 certified - dust and water resistant Water resistant up to 1 meter and 30 minutes, Super AMOLED capacitive touchscreen, 16M colors Size, Corning Gorilla Glass 3 Touch Wiz UI Card slot: micro SD, up to 64 GB Internal: 16 GB, 1.5 GB RAM, 720 x 1280 pixels, 4.5 inches (~326 ppi pixel density) Multitouch, BATTERY: Li-Ion 2100 mAh battery Stand-by
Product brand: Samsung
Target attributes: Operating System
Answer: attribute: operating system
value: android
source: product description