Sound Enhancement Amplifier Hearing Aid Machine (Rechargeable) Max sound output: 125±4dB v Sound gain: ≥38dB v Total harmonic wave distortion: ≤10% v Frequency range: 450-3500Hz v Input noise: ≤30dB v Ni-MH battery : DC 1.2V v Current: ≤2mA Operation v Insert the earplug to the hearing aid, then put the earplug in your ear, and move it up and down to insure it on the right position. v Turn on the hearing aid, and then you can adjust the volume to get clear sound. v On/Off switch: Turn on or turn off the hearing aid. v If you feel the whistling sound, please make sure if you have put the earplug, or if you have use a appropriate size earplug. v (Note : Be sure the hearing aid is in {Off} Position or Volume is in the minimum volume, otherwise the instant sound will make you uncomfortable.) Maintenance v The hearing aid doesn’t work, Check as follows : 1. Hearing is power off. 2. The hearing aid is charged. 3. Run out of battery. v Sound is very light : 1. Volume is too low, please increase the volume. 2. Battery is low, please charge it. Important Notes v The hearing aid can only be charged with matching charger (1.5V/8mA). v The capacity of the Ni-MH battery of hearing aid is 1.2V/40mah and it can work for about 24 hours continuously after full charge. v First charging will take up 8 hours to get full charge. For future charging, it only takes 4 hours. v During the charging the light on the charger will be red when the charger plugged in the electric current, and it will turn to green once the charging is completed
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