Adjustable Mini Ultra Small Invisible Sound Amplifier
Features: Max Sound Output: ≥120 dB Max Sound Gain: ≥30 dB Harmonic Wave Distortion: f<1000Hz≤10%,f>1000Hz≤4% Frequency Range: 250～3800 Hz Input Noise: ≤50 dB Battery: AG3 Button battery (included) Working Voltage: dc1.5V Working Current: ≤4mA Deacription: 1.High quality invisible hearing aid sound amplifier 2. Super mini size and light weight, not easily to be seen 3.Adjust volume to the minimum before wearing 4. Increase volume gradually to avoid sudden increase in sound 5.Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly Note: 1.Adjust volume to the minimum before wearing. 2.Choose an earplug of slightly bigger size to avoid whistler. 3.Increase volume gradually to avoid sudden increase in sound. 4.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. 5.Remove the battery if you do not use it for long time.
1 x K-80 Hearing Aid 4 x Earplug (different sizes) 2 x AG3 Button battery 1 x User Manual