<ul><li>Drive: 12mm</li><li>2. Impedance: 32 OHM</li><li>3. Bluetooth version: Bluetooth v4.1</li><li>4. Bluetooth use band: 2.4GHz</li><li>5. Power level: CLASS II</li><li>6. Output power: 30mW</li><li>7. Bluetooth distance: 10 meters barrier</li><li>8. Frequency response: 20-20000Hz</li><li>9. Operating voltage range: 3.0V-4.2</li><li>10. Mitou sensitivity: -42dB</li><li>11. With A2DP / AVRCP high quality stereo audio transmission and remote control protocol</li><li>12. Powerful noise de-noising circuit (active noise reduction)</li><li>13. switch between Chinese and English (boot does not connect Bluetooth state, press the switch 2 times, hear the tone switch successfully)</li></ul>