Model Number: RD16/OR/P4-H21 Brand Name: Royal Display Key Specifications/Special Features: Outdoor LED display is designated for outdoor events for advertisement, notice or performance purposes, which require quality of high brightness and being water-proof.Outdoor LED display is widely used in various outdoor events, including airport information display, stadium advertisement and score board, concerts and performance stages, highway billboards, shopping malls, residential quarter boards etc.We provide not only outdoor display screens and modules of different pixels, but also installation solutions based on our years of experience and participation of all sorts of programs for outdoor LED display. ParameterP3.91P4 P4.81 Pixel Pitch(mm) 3.91 4 4.81 Lamp Encapsulation SMD1921 SMD1921 SMD2727 Pixel Density(Pixel/sq.m.) 65410 62500 43222 Module Dimensions(LxWxH)/(mm) 250x250 256x128 250x250 Module Rosolution(dot) 64x64 64x32 52x52 Cabinet Dimensions(LxWxH)/(mm) 500x500 1024*768 500x500 Cabinet Rosolution(dot) 128x128 256x192 104x104 Color Grayscale(Bit) 12-16 12-16 12-16 Refresh Rate(Hz) 60 60 60 Scan 1/8 1/4 1/4 Brightness(nit） 5000 5000 4500 Optimal Horizontal Viewing Angle（°） 120 120 120 Optimal Vertical Viewing Angle（°） 50 50 50 Viewing Distance（m） 4-12 4-15 5-15 AC input Voltage(V) 110-220 110-220 110-220 AC input Frequency(Hz) 50-60 50-60 50-60 AC input Power Typical Value(W/㎡) 300 300 320 AC input Power Maximum Value(W/㎡) 680 680 1000 IP rating(Front/Rear) IP65/IP42 IP65/IP42 IP65/IP42 Lifetime Typical Value(hrs) 100000 100000 100000