... largest projection is 80 inches, have copy, extension screen function, easy solve your troubles, also can enjoy the ... RMVBLCD2.4 TFT LCD, HD, 320x240Time settingWorld time, calendar function ,time displayMachine memorywith 4G memory ,update to16GBMobile U disk ... functionMobile U disk function, support the firmware update (TF)Battery capacity2600mAhProjection time ...