... and UL or ROHS certification. Led Moving DisplayFeathersDisplay Element f 5mm (default), f 3.75mm or f 3.0mm LED dot matrixes or LED lamps for ... indoor use; f 5 or f 8 for window brightness ... .Monochrome: Red, Yellow Green, Amber, Blue, Pure Green, or White etc.Average LED lifetime 100,000 hoursPC Communication RS232, RS422, Email, Modem ...