Specification: _x005f_x000D_ Model: DD3 _x005f_x000D_ Color: Black/Blue (optional) _x005f_x000D_ Optional: With mic/without mic (optional) _x005f_x000D_ Frequency response range: 20-40000 Hz _x005f_x000D_ Sensitivity: 107dB/103dB/107dB/109dB (gear 1/2/3/4) _x005f_x000D_ Impedance: 45 Ω/35 Ω/35 Ω/34 Ω (gear 1/2/3/4) _x005f_x000D_ Unit type: 10mm dual cavity dual magnetic shaped dynamic coil unit _x005f_x000D_ Chamber material: CNC aluminum alloy+PC resin _x005f_x000D_ Pin type: 0.75mm 2Pin _x005f_x000D_ Plug type: 3.5mm metal plug _x005f_x000D_ Core type: Oxygen free copper plated silver core _x005f_x000D_ Wire size: 1.25m ± 0.05m _x005f_x000D_ Wearing method: ear wrap+in ear style _x005f_x000D_ Packaging size: 120 * 110 * 55mm/4.72 * 4.33 * 2.17 _x005f_x000D_ Gross weight: 108g _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Note: _x005f_x000D_ Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! _x005f_x000D_ Please allow 1-2cm measuring deviation due to manual measurement. _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Included: _x005f_x000D_ 2 x Earphones _x005f_x000D_ 1 x Earphone cable _x005f_x000D_ 6 pairs x Earphone silicone sleeves _x005f_x000D_ 1 x Storage bag _x005f_x000D_ 1 x Pin _x005f_x000D_ 1 x Instruction manual 1. Customizable Sound Experience: Utilizing ND Acoustic Lab's proprietary electronic crossover technology, these wired earphones offer four different tuning options with the flip of an electronic switch. Adjust the sound signature to match your personal preference and enjoy a versatile listening experience that complements various music genres. 2. Advanced Nano-level Diaphragm: The newly upgraded 10mm diaphragm, made with high-polymer crystalline material, ensures low distortion and impeccable performance. This results in precise and accurate instrument and vocal positioning, fast and accurate response, and enhanced clarity and brightness in the middle-to-high frequency range. 3. High Sound Potential: DD3 exhibits excellent drivability, delivering impressive sound quality even when connected to smartphones. When paired with a professional audio player, the potential of the sound is limitless. Compared to other headphones in the same price range, DD3 offers superior audio quality under similar conditions. 4. 0.75mm Dual Pin Design: Using the standard 0.75mm dual pin design, the earphone cable can be replaced with 2Pin limited slots, and you can choose to replace other HiFi cables or upgrade to Bluetooth-compatible earphones with Bluetooth-compatible modules according to your needs.