Name: Hearing Aid Maximum saturation sound pressure: 129dB &plusmn; 4dB; Maximum file acoustic gain: 48dB &plusmn; 5dB; Harmonic distortion: &le; 18% (450 F &le; 5000); Frequency response: 450-3000Hz; Equivalent input noise: &le; 30dB; Battery type: lithium ion battery; Working voltage: 0.2&plusmn;0.1V; Working current: &le;4mA; Features: 1. The digital processing of the hearing aid channel allows the user to adjust the volume and program. 2. The wire is separated from the earphones, which is more convenient and safer. 3. Hearing aids are suitable for people with severe hearing loss. 4. Smaller than credit cards, affordable hearing aids are sufficiently discreet and can be easily put in a pocket or handbag; Packing list: 1 x Hearing Aid 1 x Carrying Bag 1 x Power Charger 4 x Earbuds 1 x User Instruction Brochure&nbsp; Note: 1. Turn the volume to the minimum before wearing. 2. Choose a slightly larger earplug to avoid whistling. 3. Increase the volume gradually to avoid a sudden increase in the sound. 4. If you hear howling, check whether the ear (silica gel) is suitable, whether the size of the plug is tight, choose the correct ear plug and connection to ensure that there is no air leakage. 5. Keep the earplugs clean; <div class="panel panel-info"><div class="panel-heading" style="font-weight:bold;">IMPORT: THIS ITEM IS SHIPPED FROM CHINA. PLEASE EXPECT UP TO 25 DAYS FOR DELIVERY</div></div>

K-88 Hearing Aids Rechargeable Mini Hearing Aid Sound Amplifier Invisible Hear Clear For Elderly Deaf U.S. Plug