Feature: 1. Beautiful in apperance, and clear in tone 2. Easy for using 3. Different kinds to match you requirement Specifications: Model: ZT-207 Rated Power: 30w Line Voltage: 70-100v Sensitivity: 92dB Frequency Response: 40-18000HZ Londspeaker: 166mm Dimensions: 279X200X207mm Weight: 3.10KG Widely used in meeting room, school, exhibition center, square airport and other public address.