Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Sony Ericsson Z310i EDGE/GSM Mobile Camera Phone (Black)
Product description: The Sony Ericsson Z310i is just as versatile as you are. Use it as a work tool during the day. Then leave the office, hit the night club and show off with cool light effects and sophisticated backlit keys! The Z310i features a built-in digital camera with screen viewfinder, dedicated menus and direct interaction with in-phone imaging and messaging features. Plus, Bluetooth wireless technology frees more than your hands, it lets your devices talk to each other without tangles. The Z310i can also be your everyday management tool! Send and receive email, browse the Web, synchronize your PC calendar and contacts with your phone! It's designed for every occasion so you can't go wrong with the Sony Ericsson Z310i mobile camera phone !
Product feature: Sony Ericsson Z310i EDGE/GSM Mobile Camera Phone (Jetset Black) General Features: Jetset Black color, Screen: 128 x 160 pixel External screen: Icon display, Monochrome, 96 x 64 Memory: 14 MB Phone Memor, Built-in 0.3 Mega Pixel Camera JAVA Polyphonic Ringtones Speakerphone Vibrating alert Music Tones Pl, Networks: EDGE GSM 900 GSM 1800 GSM 1900 Connectivity: Bluetooth Infrared port Modem Synchronization, USB support
Product brand: Sony
Target attributes: Screen Size
Answer: attribute: screen size
value: None
source: None