... to use Menu system 17,Software upgrades through RS232 port and receiver to receiver 18,Automatic turn on/off by timer setting(multiple ... ,Up to 3x3 pictures on screen ,only 1 active 24,Video zoom function with 1/2/4/6/8/12/16 ... technology products. We engage in researching, developing and manufacturing middle and high-end digital TV receivers ,receiver accessories , Android Google Internet TV box ...