Cuffie Wireless - Headphone Driver Diameter: 50mm - Headphone Frequency Response: 15-25,000Hz / 3.5mm mode, 20-20,000Hz / 2.4G wireless mode - Headphone Impedance: 32Ω - Headphone Sensitivities: (@1KHz) 110 dB ± 3 dB - Microphone Frequency Response: 50 - 18,000Hz - Microphone Sensitivities: -40 ± 3dB (@ 1KHz) - Microphone Signal to Noise Ratio: 50 dB or more.