Stereo Bedroom Pillow Speakers - Say Goodbye to the Headset Say Goodbye Hearing Loss Speaker diameter: 40mm Impedance: 32 S.P.L: 114db S.P.L. at 1KHz Rated Power: 200 mW Aggregate Capacity: 50 mW Frequency Response: 20Hz-20,000 Hz Plug Type : 3.5 Plug