Instructions:
1.Connected the earplug with the hearing aid;
2.Put the switch to"ON";
3.Before hearing aid inserted into the ear,put the volume to the minimum position, then earplugs plugged ear canal (Note that do not leak air, because the air leakage will be form of self-excited feedback lead to whistle).
4.From small to big to adjust the volume knob to the clearest sound is ok

Wear simple, comfortable and secluded. Particularly suitable for your entertainment, leisure, listening to opera, watching TV and movies, meeting communication or class,use hearing aid sound effects are clear and loud and clear, and good choice for people who need.

Technical Parameters:
1.Max Out: ≥120dB
2.Max Gain:≥30dB
3.Average Gain:≥38dB
4.Harmonic Distortion:a)≥10% (Frequency< 1000Hz)

                                  b)≤4%(Frequency >1000Hz)

5.Equvi Input Noise:≤30dB.
6.Frequency Range:≥250Hz~3500Hz

Specification:
"NO"--Put on;
"OFF"--Put off.recharge;
""--Volume small to round.
Standard Battery: AG3 or AG312 button cell
Voltage: D.C. 1.5V
Current: ≤4mA
Product Weight:3g
Product Size:2.*1.9*1.5cm
Colour: Beige
Material: ABS
Package:Paper+ Plastic Box
Packing size:11.1*8.4*3.3cm
Carton quantity:120PCS
Catron Size:52.5*31*39cm
GW:11kg
NW:9kg