【Ergonomic Design】Featuring a unique concave-convex earbud shell design, these earphones offer a comfortable fit with minimal weight, ensuring a fatigue-free listening experience 【Precision Sound】Expertly tuned tri-band frequency response delivers pure, impactful sound across the entire sound spectrum 【Compatible with iPh Devices】Equipped with a Lightning connector, these earphones are specifically designed for iPh users, ensuring seamless integration with iPh devices 【Compact Form Factor】Left and right channels are individually crafted for a sleek, miniature profile that doesn't compromise on sound quality 【High-Quality Sound】With a wide frequency range and high sensitivity, these earphones produce clear, detailed sound for an immersive listening experience Specifications: Model: RM-510i Connector Type: Lightning Cord Length: 1200mm Material: ABS Frequency Response: 20Hz - 20KHz Impedance: 16Ω ±15% Sensitivity: 113dB ±3dB Driver Unit: 10mm Input Power: 0.25Vrms (50Hz~3KHz)