Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Apple iPhone 4 A1332 16GB White (GSM Unlocked)
Product description: This phone can be restored within iTunes. This product does not have a manufacturer warranty rather a 30-day return period with seller. At just 9.3mm, the iPhone 4 is thin as a rake but the front and back are 30 times stronger than the usual plastic. Reason - aluminosilicate glass, the stuff that windshields of military choppers are made of. The periphery is customized alloy, 5 times stronger than steel. Your accidental dropping won't hurt your pocket-communicator. The Retina Display packs in 4 times the amount of pixels (326 per inch) of iPhone 3, and makes the text and images slicing sharp. Thanks to the added 960 x 640 pixel screen watching of HD movies on the iPhone 4 becomes a gasp. When you become a shutterbug behind the iPhone 4 camera, you shoot 5 megapixel images and high-definition videos at 720p resolution, with the LED flash and autofocus that make things easier. Opt for the iMovie video editing software, and you become a movie maker. If you happen to have Wi-Fi around, the FaceTime feature gets you into true worldwide video chat and 'staying in touch' becomes real personal. And all it takes to choose between the front and rear camera is a tap. The 3-axis gyro, when coupled with accelerometer, results in 6-axis motion sensing, and that's as good as it can ever get for gaming on a cell phone. With 7 hours of talk time (3G)/10 hours of video/40 hours of audio, the iPhone 4 packs in enough power to let you do fast multitasking.
Product feature: GSM Factory Unlocked: Device is unlocked for use on any GSM network, please contact your service provider prior to purchasing to ensure full compatibility. GSM providers include AT&T & T-Mobile. Not compatible with Sprint or Verizon.., Wi-Fi 802.11b/g/n Wi-Fi (802.11n 2.4GHz only). Bluetooth 2.1 + EDR wireless technology.., Features: Video recording, HD (720p) up to 30 frames per second with audio, 5-megapixel still camera, VGA-quality photos and video at up to 30 frames per second with the front camera.., In the package: iPhone 4 16GB, USB Cable, Wall Charger, Earphones with Remote and Mic, Documentation. (Micro-SIM required, not included. Please obtain from service provider).., Warranty: Item has been discontinued by manufacturer and no longer has a manufacturer warranty. Please see seller condition notes for warranty information, if any..
Product brand: Apple
Target attributes: Battery Life
Answer: attribute: battery life
value: None
source: None