Descriptions:* Frequency range: 20-20KHz * Sensitivity:-52dB * Impedance: 150 (Ω) * Speaker Diameter: 38mm Microphone length: 15cm * Cable length: 88-100cm (curved) * Connecting plug: Φ3.5 mm * Note: Improve call quality, more comfortable.Eliminate over 96% of mobile phone radiationConnection mode switching is surpported.* Color: 4 Colors as picture shows for Choice * QTY: 1 PC/Set * Shipping : We ship from China via B-post, taking 6-9 business days to arrive.