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VJJB K1 Uses magnetic neodymium iron boron magnets strongest drive unit, equipped with high - performance dynamic driver systems,9.7 MM custom permanent magnet high-performance moving coil unit. Exclusive tuning technology triband clear, natural, unique sensing technology to suppress high frequency glitches. Tone your earplugs subvert traditional visual impression, the ultimate balance between classic Almighty. Sophisticated technology, one piece metal casing to prevent accidental vibration and noise. The ultimate music experience. Specifications: Driver units: 9.7mm. Rated impedance: 16 ohm. Sensitivity: 110dB. Frequency response: 20Hz -24000Hz. Distortion: <1% . Channel balance: <2 dB. Maximum power: 20mW. Gold plated plug: 3.5mm