red/blue bus multilingual system

● Ear shell Material : ABS ● Speaker : 15mm ● Line material : PVC ● Length : 1.2cm/by design ● Plug diameter : 3.5mm ● Impedance : 32Ω ● Frequency Range : 20-20kHz ● Sencitivity : 100+/-3db ● No micriphone ● Color : Red, blue, black and etc ● Size:80cm*12cm*3.5cm & Custom size ● Color:Full color ● Resolution:128*16 ● Word count:8 ● Communication:RS485 and USB ● Voltage:12V-24V ● Standard: a set of screen ● Interconnect with our report station ● Ear shell Material : ABS ●