Feature: 1. Concise and trendy outline, Installation is simple and can be adjusted 2. Provide grilles with different pattern for choice. 3. All plastic parts are molded by advanced technology, with high degree of finish 4. All ceiling speakers employ full-range driver with a whizzer for better high-frequency performance. 5. Different connection styles for different power outputs, convenient and reliable. Specifications: Model: ZT-501 Rated Power: 3-6w Line Voltage: 70-100v Sensitivity: 91dB Frequency Response: 90-16000HZ Londspeaker: 158mm Hole Dimensions: 180mm Material: ABS Dimensions: 225X90mm Net Weight: 0.95KG Application: Widely used in in Hotel, emporium, school, auditorium, gymnasium, exhibition center, and so on.