DescriptionF-15 is a small hearing aid, it's comfortable for wearing and invisible. When you see film / watch movie, enjoy the drama / watch the play, attend meeting, or have classes, the product can help you to hear the sound clearly and loudly. While in forest, if you want to hear very slight sound, it will be a good choice.Features- Color: As shown- Material: ABS- Size: 10x9x4cm- Max Sound Output: 1294 dB- Max Sound Gain: 55dB5dB- Harmonic Wave Distortion: 5%- Frequency Range: 350~3500 hz- Input Noise: 30 dB- Battery: 1 x AA battery (Without Battery)- Working Voltage: dc1.5V- Working Current: 4mA- Different size noise prevention earplug for selection.- Clear and loud voice.- Advanced analogue hearing aid.- Super mini size and light weight, not easily to be seen.- Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly.Note- 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.- If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.- Keep the ear plug clean.- Remove the battery if you don't use it for long time.
