... ~, 50Hz/60Hz DC9V ,4.5A, lithium battery 1450mAH,7.4VTechnology :LCD 2"Screw Hole:General specifications of projectorTrapezoid Correction:Auto /Vertical ... equipment can't use long time?A:Please test the connecting line is correct insertion related interface inside, whether enough power ... you have any questions,please feel free to contact me. LCD 2'' Portable mini projector for Home theater