Amazingly clear and precise, medically approved, in the ear HEARING AID, Digital volume and frequency program suitable as required by different needs, conversation easier.And enriches the sounds around the head to make the world becomes an easier place!Size: 54 * 16 * 10mmWeight: 9gAlways use: over 10 hoursStayby Time: Over 5 daysMax sound output: 130 ± 4dBTotal Harmonic Distortion: ?10%Frequency range: 450-3500HzInput noise: ?32dBVoltage: d.c1.5VCurrent: ?8mA? attention:(1) Please read this manual carefully before using this hearing aid.(2) In case of hearing the Whistlers, please select the earplug of appropriate size and pin it. No air leakage is allowed.(3) Note: After wearing hearing aids for a period, use brush to clean up the oil residue, cerumen.
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