Optoma ML550 WXGA 500 Lumen 3D Ready Portable DLP LED Projector with MHL Enabled HDMI Port Incredibly small, yet unbelievably bright Comprehensive connectivity for maximum compatibility Powerful LED light source means no lamps to replace 3D Ready for the most amazing, immersive 3D viewing experience; Projection Screen Size 0.43 - 2.54m (17" - 100") Diagonal 16:10; Projection Distance 0.55 - 3.23 metres Wireless presentation capability via optional BI-EXTBGN adapter; Refer user manual under technical specification for trouble shooting steps