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

Input:
Product title: UNLOCKED QUAD BAND QWERTY Wi-Fi QWERTY DUAL SIM FM GSM CELL PHONE X897i BLACK
Product feature: 1x Quality A battery with 2 IC 1100MAH, 1 x Travel Charger, 1 x USB Cable, 1 x User's Manual, 1 x Wired Earphones with MIC
Product brand: XPHONEX
Target attributes: Screen Size
Answer: attribute: screen size
value: None
source: None