• Max Saturated Sound Pressure: 130dB+5dB
• Harmonic Wave Distortion:≤ 5%
• Frequency response Range: 300— 4000 Hz
• Input Noise: ≤ 30 dB
• Battery Type: AG13 button cell battery (included)

Specification:
100% brand new sound amplifier behind the ear
Super mini size and light weight, not easily to be seen
Adjust volume to the minimum before wearing
Choose an earplug of slightly bigger size to avoid whistler
Increase volume gradually to avoid sudden increase in sound
Technical Specifications:
Max Saturated Sound Pressure: 130dB+5dB
Harmonic Wave Distortion:≤ 5%
Frequency response Range: 300— 4000 Hz
Input Noise: ≤ 30 dB
Power Voltage :1.5 V

Working Current : ≤4mA
Battery Type: AG13 button cell battery (included)