Service & Warranty – Unlimited customer service every 24*7 hour, 30 days full refund without hassle, 1 year replacement warranty. Unique Design - Large enough for daily operation. Worn completely in the ear without being conspicuous. Magnetic recharging case prevents the devices from losing. Rechargeable with Larger Capacity – The compact charging box provides 250hrs backup power for every 2 hours charging. You can use it for 1 weeks with no need to charge again. Easy Operation – No complicated modes and buttons. Auto turn ON/OFF while in/out of the charging box. Adjust sound volume by finger without tools. No need to tell Left/Right. Not too small, but large enough for finger operation. Excellent Hearing Experience – With intelligent noise reduction chip provides natural sound, this Autiphon U01 hearing aid is great choice to mild to moderate-severe hearing loss. The whistling -proof dome makes it not whistle at any volume. Higher sound gain than most other hearing aids.