Description: When you see the movie, watch the play,enjoy the movies and drama,attend meeting,or have class,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. Specifications: * Max sound out put: 130 /- 50dB * Sound gain: 50dB * Total harmonic wave distortion: 5% * Frequency range: 300-4000MHz * Input Noise: 30dB * Voltage:d.c.1.5V * Current: 4mA * Model No: F-139 * Material: Plastic * Color: Skin * Net Weight: 8.gm Function: . It can be used for sound amplifier . When you watch movie, enjoy the drama, 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 User Manuel: Before use, make sure that power is turned off, or make the volume to a minimum Put the ear hook on your ear, plug in the ear plug tightly Turn on the power, and adjust the sound volume to get clear sound If you hear the whistling sound, please check if the plug in the ear is tightly. If it can't be plug tightly, please change the other size plug Package: * Axon F-139 hearing aid ear machine * Soft ear plug * Battery * Box * User manual
