Projection technology: 4" LCD Bright (lights) 2800 lumens. Type of bulb: LED. Native solution: Ultra HD 4K. Contrast reference: 1500:1. Useful life of the lamp (hours): H. Related: 4:3/16:9/16. Keystone correction: 10 Keystone manual, V4/-15° Projection distance: 1-4 meters. System: Linux system duplication with Lightning or USB data cable: data cable, Wifi connection (Miracast, Airplay). Lens: manual approach. Projection screen size: 36~150 inches. Wi-Fi: 2.4 GHz. Speakers included: 2 3 watt speakers.