Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: LG GW550 GSM Unlocked Smartphone with 3MP Camera, Windows Mobile, Full Qwerty Keyboard, Memory Card Slot-International Version with No Warranty (Dark Brown)
Product description: First and foremost a communicator, the GW550 Windows phone fits more into less, creating a dynamic mobile experience that easiy handles all your needs from work to play. Wide QWERTY for precise input: The keypad takes up maximum real estate, resulting in larger, more spread out keys that enable precise input, even for clumsy thumbs. Slightly curved for ergonomic comfort, the QWERTY keypad is a perfect fit for your smart mobile life. Smart applications: instant access to favourite apps: Smart Applications offer customizable shortcuts to your most often used apps. Smart email - streamline your inbox: The smart email hotkeys takes you to a streamlined inbox that displayes only pre-defined emails. Eliminate the clutter and make sure that email from key contacts get special delivery right to your mobile. Slim profile, premium look: Measure at 12mm slim, it spots a sophisticated and sleek look on your palm. Smart contacts: manage important people: Smart contacts organize a virtual relodex of up to 20 VIPs and with easy icons, you can call, text message and send email with one touch. Enhanced speakerphone: A great sound booster, the GW5205 Windows Phone features dual speakers that ring loud and clear. The back design optimizes the sound, meaning this phone can compete with any ambient noise.
Product feature: Windows Mobile 6.5 Standard, Smart applications: instant access to favourite apps, Smart contacts: manage important people, Wide QWERTY for precise input, GSM (850/900/1800/1900), HSDPA (900/2100)
Product brand: LG
Target attributes: Screen Size
Answer: attribute: screen size
value: None
source: None