Flexible Adafruit DotStar Matrix 16x16 - 256 RGB LED Pixels
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16*16 P10 Rgb Full Color 16x16 Dip Outdoor Rgb Led Screen Module (chip Ic5024 Hub75) - Led Displays - AliExpress
Outdoor LED Display P10 Medium 16x16 RGB LED Matrix Panel(6.3" x 6.3" x 0.5") $26.75
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