The iSing Karoke machine from Vivitar is portable (and packable) and allows you to sing Karaoke directly from your iPad, iPod, phone, tablet…pretty much anything where you can find a Karoke app!
To use the machine you just plug the supplied power cord into an outlet and plug the audio cord into your iPad. (Or whatever device you’re using.)
The load up your Karoke app, like Karaoke Anywhere and you’re ready to go! The built in arms hold your iPad securely in place. (I did have to take off the outer sleeve of my OtterBox for my iPad to fit.)