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english export packaging elderly hearing aid battery hearing aid loudspeaker hearing aid
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电声性能：
1.最大饱和声压级：≥120 dB
2.满档声增益：≥30 dB
3.平均增益：≥18dB
4.谐波失真：
a)频率小于1000Hz时不大于10%
b)频率大于1000Hz时不大于4%
5.等效噪声：≤50dB。
6.频率响应：不窄于250Hz～3500Hz
Features
Brand new and high quality hearing aid sound amplifier
Super mini size and light weight, not easily to be seen
Adjust volume to the minimum before wearing
Increase volume gradually to avoid sudden increase in sound
Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly
Specification:
1. Max sound output: 110±5dB
2. Sound gain: ≥30dB
3. Total harmonic wave distortion: ≤10%
4. Frequency range: 300-4000Hz
5. Input noise: ≤40dB
6. Voltage: DC1.5V
7. Current: ≤4mA
8. Color: As pictures
Package Included:
1 x Hearing Aids
2 x AG3 Button Cells
1 x Instruction Manual
1 x Case
3 x Units of earplug of different size