DS18 GEN-TWR16 80 Watts Piezo Super Tweeter - Set of 2 This High-Powered Tweeter Delivers 80 Watts of Power Built-in Crossover, Easy Installation, Any Car Audio System, Works with Existing Radio (No Amplifier Needed), Fits in Most Places, No Magnetic Field. Impedance: 4-Ohms and 8-Ohms, Sensitivity: 101 Decibels Frequency Response: 5,000-20,000 Hertz, Crossover Frequency: 5,000 Hertz Accessories Included: 2 Angle Mounts, 2 Surface Mounts, 2 Regular Angle Mounts, 6 Mounting Screws, 2-Self-Adhesive Disk