Product Specification: 1. Frequency response: 20-20,000 Hz 2. Impedance: 32 Ohm 3. Power Capability: 30mW 4. Sensitivity: 105dB +/- 3dB at 1KHz 5. Speaker diameter: 40 mm 6. Connector: 3.5 mm stereo 7. Stn ratio: >= 58dB 8. Input sensitivity: -42dB +/- 3dB