Thank you for viewing. This is an unopened item won in a giveaway. These headphones feature active noise cancellation and offer 70 hours of wireless playback. - Model Name: Monitor III A.N.C. - Active Noise Cancellation: Yes - Wireless Playtime: 70 hours - Transducer: 40 mm, Dynamic - Impedance: 32 Ω - Frequency Range: 20 Hz - 20 kHz - Sensitivity: 117 dB SPL (1 mW @ 1 kHz) - Color: Black