the p4 , after research be the pico projector I decide to go with . it be surprisingly bright for its small size . the image be crisp and clear . I mainly use it to project movie from my laptop but it come with Windows CE so if you be one to do presentation , with a usb mouse you can use the build in software to access word\/powerpoint\/excel . I have use a apple vga adapter to mirror my iphone 4 as well and it work brilliantly . I would definitely recommend this projector if you be in the market for a small , portable projector .