... customer's demand. Thank you very much for your support! Specification1. Low Radiation, support ... Frequency response: 20Hz-20,000Hz 9. Sensitivity: -80dB±3% 10. Impedance: 32 ohms11. Speaker diameter: 30mm12 ... Blue, Red, purple, yellow, pink, green, orange, black, whiter, pearly white)16. Material: Plastic, or Plastic ... before shipment.RemarkMade in China wireless bluetooth headphone,bluetooth handset