well this be my first projector and I get to say that its pretty good , even during the day you can still see the picture if its like a 30 inch size screen . I have not use it unplugged because to I it be like a tv , it need to be plug in , I would not expect the battery life to last long so I do not even bother . I get the control for it which be a must unless you want to keep press button on the projector which end up move the picture . it have its own little built-in speaker which be actually pretty decent sound but its not loud enough for I so I just plug some computer speaker in the audio jack and boom , problem solve . if you have a xbox or ps3 get the hdmus to mini hdmus cable , there like $ 8 and it put the picture to 720p which be not bad for a projector if you ask I . another cool thing be you can flip the image sideways or upside down if for some reason you have to . overall its awesome , especially if you on the go or in the military like I be , you just can not carry around a tv everywhere you go but a projector you can , especially this tiny little thing .