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: Speck SkinTight Silicone Case for iPod classic 3G (Cobalt Blue)
Product description: Speck Products' 3G SkinTight iPod skin protects a user's 3G iPod against dust, knocks, and scratches, letting users enjoy their favorite music while on the move. iPod skins are made of shock-absorbing, tear-resistant Kraton plastic, which is easy to apply and lasts for years. In addition, the bottom flap pivots open, so you can dock your iPod without removing it from the case. To apply, simply stretch the elastomer skin over your iPod from the skin's bottom opening or the scroll wheel cutout. The skin comes in a translucent cobalt blue color, though Speck Products also sells clear and lime-colored skins, each of which fits the 10, 15, 20, 30, and 40 third-generation (3G) iPod models., A cool accessory to personalize your iPod. The unique rubber skin case provides protection against dust, knocks, and scratches without adding bulk. You can even dock your iPod without removing it from the Skin. In Cobalt Blue. Fits 10, 15, 20, 30, & 40 GB iPods.
Product feature: Flexible blue iPod skin cover designed for 3G iPods, Protects iPod from dust, knocks, and scratches, Made of shock-absorbing, tear-resistant Kraton plastic, Bottom flap pivots open for iPod docking, Applies easily by stretching elastomer material from bottom opening
Product brand: Speck
Target attributes: Compatibility
Answer: attribute: compatibility
value: for ipod
source: product title
attribute: compatibility
value: ipod
source: product description
attribute: compatibility
value: ipod
source: product feature
attribute: compatibility
value: for ipod
source: product feature