I like this for when im on holiday, I like to watch videos on my tablet at home but don't like to take it on holidays or long journeys because its expensive and im always scared to break it.
I can use this to make my phone screen look bigger, it also has a built in speaker which connects to my phone via bluetooth which is good too, the startup voice is a bit weird sounding but the actual sound quality of music is very good.
It comes with a cable to power it which will also be used as the charger if you insert a rechargeable battery at the back, rechargable battery is not included but can be bought online easily enough.