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_ Weight: 0.68 pound (0.69 pound for cellular versions)

_ Cameras: 5-megapixel camera on back and a low-resolution camera on front, for videoconferencing

_ Battery life: 10 hours

_ Operating system: Apple’s iOS

Pros: Unmatched access to third-party applications, high-quality Apple software and the iTunes store. High-resolution screen. Available with access to fast 4G wireless broadband networks, starting at $459.

Cons: Data storage cannot be expanded with memory cards.

Barnes & Noble Inc.’s Nook HD (available Thursday)

_ Price: $199 with 8 gigabytes of storage, $229 with 16 GB

_ Screen size: 7 inches diagonally

_ Screen resolution: 1440 by 900 pixels

_ Weight: 0.69 pound

_ Cameras: None

_ Battery life: Up to 10.5 hours of reading and up to 9 hours of video

_ Operating system: Modified version of Google’s Android

Pros: Expandable with microSD card. High-definition screen. Larger-screen version available Nov. 1 as well.

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