Hearing aid MaxSound Output: 130±5 dB MaxSound Gain: 55±5 dB Harmonic Wave Distortion:≤10％(1000Hz) FrequencyRange: 300-4500 Hz Input Noise:≤30 dB Battery: AG13 Button batteries (included 1pcs ,due to post mail donot allow ship too more battery ,we will ship 1pcs battery for your reference.) Working Voltage: dc1.5V Working Current:≤3mA Color: As the picture shows Item Size: 3.8 x 2.1 x 0.9 x 3cm Package Size: 19 x 8.2 x 2cm Net Weight: 9g Package included 1 x JZ-1088A Hearing aid 3 x Earplug (different sizes) 1 x User manual 1 x Box ( optional ) Note 1.Adjust volume to the minimum before wearing. 2.Choose an earplug of slightly bigger size to avoid whistler. 3.Increase volume gradually to avoid sudden increase in sound. 4.If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage. 5.Keep the ear plug clean 6.Remove the battery if you don't use it for long time.

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