Highlights: Model: AKJ-XMK03 Dynamic sound stereo headphone Adopting the muted sound Style: Wired Use: Lectures Teaching Lessons Education Frequency Range: 30Hz ~ 15000Hz Impedance: 2.2K Ohm Sensitivity: -52dB ± 5dB Color: Black Product Description: Frequency Range: 30Hz~15000Hz Impedance: 2.2K Ohm Sensitivity: -52dB±5dB Plugging: 3.5mm Length of cable: Approx 2m(It is only for the reference. Nei weight: 11 g Package weight: 37 g Color: Black