Features:
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
Can help you to hear the sound clearly and loudly.

Specifications:
Model: K-86
Max sound output:110±5dB
Sound gain: ≥30dB
Total harmonic wave distortion: ≤10%
Frequency range:300-4000Hz
Input noise: ≤40dB
Voltage: DC 1.5V
Current: ≤4mA

Package included:
1 x Ear Sound Amplifier
1 x User Manual
2 x Button Battery
3 x Earplug of Different Size