The projection light source has a service life of up to 30,000 hours, with multi-layer high-transmittance lenses, if plays 4 hours a day, it will be used for about 20 years Using 40° automatic digital keystone vertical distortion correction technology, instant and fast display of square screen 1.35:1 short focal ratio, so you can always get a big screen in a short throw distance Smart Android 7.1.2 operating system, smooth operation, numerous film and television resources, download whatever software you want to download Bluetooth 4.2 connection is more stable, effective distance of 10 meters, widely compatible with various devices (Bluetooth keyboard, Bluetooth mouse, Bluetooth audio) Specifications： Model: D048A Projection technology: DLP (0.2''DMD) Light source: RGB LED Projection light source life: 30,000 hours Original resolution: WVGA 854*480 (support full HD) Brightness: 70 Ansi Lumens Throw ratio: 1.35:1 Projection distance: 0.5-3 meters Projection area: 20-80 inches Contrast: 2000:1 Focus Mode: Manual Keystone: Automatic, vertical: ±40 degrees, manual angle correction OS: Android 7.1.2 Control method: touch keys, remote control, mouse, smartphone, etc. Screen Mirroring: Wired & Wireless Connections Language: Multilingual CPU: RK3128 Random Access Memory: 1GB DDR3 and 16GB Wi-Fi: 2.4G&5G Bluetooth: 4.2 Speaker: 1W Battery: 3600MAH Working time: about 1.5 hours Power performance: DC 5V Ports: USB 2.0, HD In, Audio Out, DC In Aspect: 60*60*58mm Weight: 210g