... LED dot matrix display Specification: 1) Dots Size: 1.9mm 3.0mm.3.7mm,5.0mm,10.0mm, according to requirements (various dimensions available) 2 ... ) Color: red, green, yellow, blue, orange. 3) Characteristics: Long life-span, low ... : outdoor or indoor using, elevators/lift, led strip display, clock display and other different display areas of equipments.