Dell, known for its laptop and desktops, has launched a new Android 2.2-based touchscreen tablet computer Streak 7, expanding its mobility portfolio. The computer giant also showcased a new smartphone, the Venue.

Streak 7 tablet, whose price not yet disclosed, boasts of a seven-inch multi-touch screen, a dual core 1GHz NVIDIA Tegra 2 processor, 1.3MP front-facing camera, rear-facing 5 MP camera and weighs 450 grams.

Dell said the new tablet is its first 4G tablet to take full advantage of US wireless carrier T-Mobile’s 4G network, the nation’s largest.

The Streak 7 tablet, one of dozens of such devices being launched at the Consumer Electronics Show, is expected to be available in the U.S. in the coming weeks at T-Mobile retail stores,, and direct from Dell.

The new Streak 7 enables immediate and instant access to great content like movies, television shows, home videos and more – and is the perfect social networking companion for the constantly connected, Dell said.

Streak 7's predessor - Streak 5 Android tablet - was released last year and its features included: a five-inch screen, 1-GHz Qualcomm Snapdragon QSD8250 processor and an 5MP auto-focus camera.

The new Streak 7 will feature Dell’s Stage software, which provides users simpler, faster access to their favorite content – from music, to movies to TV shows as well as Qik Video Chat, a video calling service.

Later this year, Dell said it will add syncing to Stage so people can keep their photos, contacts, calendars and other personal content synchronized across their Dell Stage-equipped devices, from tablets to PCs, connected through their home network.

Dell also showcased a new smartphone, the Venue, using Google's Android software. Late last year, the company unveiled a smartphone powered by Microsoft's Windows Phone 7 mobile operating system.