Feature: 1. Fine and exquisite sound quality 2. Concise and trendy outline, easy and prompt installation 3. Different kinds and reasonable prices Specifications: Model: ZT-20G--ZT-50G Rated Power: 40W-100W Line Voltage: 70-100v Sensitivity: 91dB Frequency Response: 90-18000HZ Londspeaker: 166x2(3x4)mm Material: ABS Dimensions: 520(736/952/1168)mm Weight: 4.6/6.4/7.9/9.2KG Application: Widely used in in Hotel, emporium, school, auditorium, gymnasium, exhibition center, park, and so on.