Eachine F-138 Adjustable Tone Digital Hearing Aid Behind Ear Sound Amplifier

Description : F-138 Adjustable Tone Digital Hearing Aid Behind Ear Sound Amplifier This digital amplifier can help you get a more clear sound, it is a great item to help people pick a better hearing. Convenient wear Low noise,low distortion. The wire plug connected to the headset.Then earplug connector (hard) to the headset. earbuds (silica gel) to connect to the headphone connector pedestal The battery installation: Gently open the battery compartment cover. put a AG13/LR44 battery into the battery compartment in the right direction, then close the battery compartment. Before you use this item, you have to turn the O-N switch to O(off) and turn the sound volume to minimum. Then put this item on you ear, keep it tightly. Next, turn this item on(O-N to N) adjust the volume until you hear clear sound. This hearing aid is packaged in a nice retail box which is perfect for retailling. Specification : Maximum sound output: 130 5dB Sound gain: 50dB Total harmonic distortion: 5% Frequency range: 300Hz ~ 40000Hz Input Noise: 30 dB Operating voltage: 1.5V Battery model LR44 Current: 4mA Weight: 74g Package included : 1 x Digital Tone Hearing Aid 2 x 1.5V Battery 2 x Earplug 1 x Earplug Connector 1 x English User Manual Details pictures :