. Built-in Android 4.4 system, allow (WIFI) wireless Internet access. 2. Wireless connection with Android mobile phones, iPhone, IPAD, etc. 3. Built-in battery is able to play about 3 hours. 4. Built-in super-long life battery plays more than 2.5 hours. 5. Built-in document viewer allows for playback of OFFICE documents 6. Support U disk, TF card plug and play 7. Connect to external Bluetooth speaker and wired speaker 8. The projection display based on DLP technology caters for the requirements of large-area image and high resolution 9. Wireless displaying on the same screen Product Parameters: Projection Technology: DLP Display chip: 0.3DMD + RGBLED Projector Features: Interactive Lamp brightness: 1000 lumens Lamp type: LED Brightness uniformity> 85% Contrast ratio 2000: 1 Standard resolution: 850 * 480 Projection ratio: 1.19: 1 Projection range: 30-120 inches Projection distance: 1-5 meters Screen width ratio: 4: 3 / 16: 9 / 16: 10 Keystone: Manual, vertical: ± 40 degrees Projection: front projection CPU: RK3128 Frequency: quad-core ARM Cortex-A7 CPU with up to 1.2GHz Cache: 1G DDR3 Memory: 8GB Operating system Android 4.4 Supported Video Format: MPEG-1, MPEG-2, MPEG-4, H.263, H.264, Supported Audio Format: MP3, WMA, MP2, OGG, AAC, M4A, MA4, FLAC, APE, 3GP, WAV Supported Photo Format: Supports variety of image formats browsing (jpg, png, bmp etc.) Supported Flash Format: Supports flash 11.1 Extended storage: support TF card and hard drive TF card: maximum 32G HDMI: HDMI 1.4 Bluetooth: BT4.0 Input support: USB, IR Remote control: support infrared and 2.4G wireless remote control Output terminals: 1 x HDMI 1.4 2 × USB supporting USB hard disk data read 1 × headphone output audio output .3.5mm connector ( which can be connected to headphones or speakers ) Machine power consumption 5W Built-in 3.7V battery: 4200MA Packing List: 1 x English manual 1 x Adapter 1 x Projector 1 x HDMI Cable 1 x Remote Control 1 x Bracket