Gigastone announced the availability of the SmartBox at U.S. retailers nationwide. The patented SmartBox is three devices in one -- a wireless card reader, portable content streamer, and backup battery charger. With a free mobile app for Apple and Android, up to six users can wirelessly stream content to their tablet or smartphone, without an Internet connection.

The SmartBox is a revolutionary mobile accessory that gives the ability to wirelessly stream SD content to an Apple or Android tablet or smartphone. All they need is an SD card with favorite music, movies and photos loaded on to it, plus the free SmartBox mobile app for Apple or Android, and can instantly stream those items to mobile device for up to eight hours. Perfect for traveling and everyday use on the go, the SmartBox is small enough to fit in pocket (about the size of a deck of cards) and weighs only 0.2 pounds.

It is compatible with SD, SDHC, SDXC and microSD cards (with included adapter) up to 2TB. The SmartBox allows for a two-way transfer between mobile devices and SD cards. The Gigastone SmartBox is currently at Fry's, B&H, BestBuy.com and Amazon.com starting at $39.99.

It includes a microSD adapter and USB cable for charging.