Product Name: Speaker TZ-518THS Model NO.: TZ-518THS Style: Head-mounted Transducer Principle: Piezoceramics Speaker Cone: Paper Cone Transmission Mode: Air-conduction Category: Speaker Trademark: armybeat Origin: China Product Description . These speakers are ideally suited for a wide variety of applications, fron restaurants, coffees, offices and specialty retail stores to offices and airports.. Two music paths system with delicate and clear sound quality. Easy and prompt installation, flexible assembly concise and trendy outline. Multi-station push-in connector is convenient for the engineering installation and collocationTZ-518THSPower taps: 2.5/5/10/20W/8ΩLine voltage: 100VSensitivity(1m, 1W): 89± 3dBFrequency response: 90-18KHzDimensions(mm): 190*190*145Hole for mounting: 160*160Material(panel): ABSMaterial(cover): IRonWeight(kg): 1.8Speaker units: 5"