I buy this base on all the good review , of course , maybe I should have read all the review except just look at the 4 star rating . we be excite about this little portable projector even though I kinda doubt at 50 luman what it can do . but it seem other people like it , one review mention on the road presentation be pretty good . anyway , we get the little thing and test it , it just can not compare to the 2000 luman larger projector . it be not bad for presentation w \/ large font , but if you need to see smaller font like look at standard website w \/ paragraph text , it will not do . we staff try and it will not work that type of presentation -lrb- which be need in we case -rrb- . plus overall just not that bright . oh when it be on battery and not on power \/ ac adapter , it will be even dimmer . with the ac be ok , sub-standard , but on battery be not acceptable in a lite room -lrb- in my standard -rrb- .