Electroacoustic Performance:

1. Maximum saturation sound pressure level: ≥ 120 dB
2. Sound gain of full gear: ≥ 30 dB
3. Average gain: ≥ 18dB
4. Harmonic distortion:

a) no more than 10% when the frequency is less than 1000Hz
b) no more than 4% when the frequency is greater than 1000Hz
5. Equivalent noise: ≤ 50dB.
6. Frequency response: Not narrower than 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