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Features: 1 sound output:129±3dB 2 gain: ≥40±5dB three harmonic wave distortion: ≤10% 4 range:450-3400MHz five Noise: ≤32dB 6: d 7: ≤2mA eight Full charging with about 6 hours nine Working about 48 hours List: 1 x Main Unit four x Earplugs 1 x Brush 1 x User Manual 1 x USB Charging cable