42 and 55-inch LCD screen combination, you can choose another size combination product features: 1. Power Loop; 2. Supported file formats: JPG, MP3, MPG1/2/4, AVI, DIVX; 3. A super-timer day 5 can be set up to timing, 7 days a week, 24 hours a day without staff. (For building advertising); 4. Support breakpoint memory function 5. Support calendar function; 6. Support for generating the log file function; 7. Support the file selection function (in the file is playing, if you need to read relevant documents, the direct use Enter the corresponding name of the remote control can be, such as file 1, press 1); 8. Support OTG function, a key copied, you can copy directly from the USB 9. support the power-on password, to prevent malicious replacement of documents; 10. to support real-time software upgrades . Product parameters: 1, Resolution: 1920 * 1080 2, Angle: 85/85/85/85 L / R / U / D 3, color: 16. 7M 4, Brightness: 800 cd/m2 5, Contrast: 1000: 1. 7, response time: <3ms. 8, supports decoding formats: Support HD JPG/BMP/MP3/MPEG1/2/4 9, the working environment: -10 to 50 can choose online mode (extra fee)