... billboard outdoor advertising billboard, display equipment, signboard T type single column trivision, tri-vision, trivision display billboard,outdoor ... , current 0.54A, frequency 50HZ, power 90W. Wind resistance: no less than 7 class.Operation service life: qualified ... customers requirement) A. synchronous B. Wave type C. Curtain opening type D. Curtain closing type E. Flipping step by step. F ...