Brand AcerAspect Ratio 16:9, 4:3Mid range Projector for Business Meeting Rooms, Education, Sports Viewing & Other Essentials4500 ANSI LumensSVGA (800 x 600) Native Resolution1920 x 1200 Maximum Resolution20000:1 Contrast RatioHDMI 3D DisplayFootball Mode Enhances Picture Quality for sports viewingAcer LumiSense Technology for image qualityAcer ColorBoost3D brings true to life colorAcer ColorSafe II Technology preventing colour decay6000 Hrs Lamp Life (STD) / 15,000 Hrs (ECO)Input: VGA, HDMI, Audio, RCA & USBOptional Wireless projection (Required Dongle sold separately)1 x USB (Type A) for wireless dongle40? (Vertical, Manual & Auto) Keystone3W Internal SpeakerUSB Wi-Fi DongleAcer EcoProjection reduces power consumption up to 70%Built in speaker24/7 operation