1. Compliant with ATSC A/52 and QAM ITU-TJ.83ANNEX B 64/256 2. Use high performance ATSC/QAM demodulator 3. Provide antenna power supply function for pair use with active antenna 4. Favorite channel list 5. Closed caption supported 6. 3 Sets of video output for tourist bus and vent to install with 3 ,onitors 7. AV input fot other DVD/GPS GAME application 8. OSD options:English,Spanish and French 9. Electronic program guide(EPG)and on screen channel information 10. RS232 for sortware upgrade by PC 11. Wide DC power input from DC 10V to 24V suitable for car. 12. AV,YC and Y Pr Pb or Y Cr Cb 13. HDTV scale to SDTV 720X480P or 4801 output . Dimension:125(L)x71(W)x27(H)mm Packing Size(gift box): 164(L)x160(W)x44(H)mm.