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heairng aids新款跨境助听器USB充电耳背式舒适 6档音量调节
| skin color(肤色) | USD $0.0 | 7042 piece available |
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| blue(蓝色) | USD $0.0 | 7000 piece available |
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| silver(银色) | USD $0.0 | 8000 piece available |
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| black(黑色) | USD $0.0 | 9000 piece available |
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Features:
1.Max sound out put:118+/- 4dB
2.Sound gain:>= 32dB+/- 2dB
3.Total harmonic wave distortion:<= 7%
4.Frequency range:300-3800MHz
5.Input Noise:<=32dB
6.Voltage:d.c.3.7V
7.Current:<=2mA
8. Full charging about 3 hours
9. Normal working about 45 hours
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