The Kingston MobileLite is one fantastic device, it is an external media Wi-Fi server and allows you to plug in either SD Cards or USB Sticks and serve content over Wi-Fi. You connect your mobile device to it as you would to a Wi-Fi network and you can stream live video from your MobileLite to up to 3 devices at the same time, even if streaming 3 separate media files.
Here is me talking about it and why this is one of my favorite devices for when I travel with my family.
Any questions about the Kingston MobileLite, let me know, I know this device inside and out and am a huge advocate and fan of it.