1, Professional MQC 2, Free sample 3, All-heart service 4, Best price 5, Reply in 12 hours 1, Standard UL Subject 758, UL 1581 CSA C22.2 NO. 210.2 2, Application Sound broadcast, audio instumentation and computer cable for ELA RS-232 appliance Operating Temperature: -20°C~80°C 3, Specification 4, structural Picture