Unlimited Support: Tumin each pair device comes with 3 types/3 sizes ear domes to make wearing more comfortable, improving your life with care. 7*24hrs technical support and 12+6 months hassle-free warranty. Longer & Lasting Battery Life: Tumin hearing aids saves your trouble to buy button batteries frequently. It runs with high quality rechargeable lithium battery and features 35 hours continuously after fully charged. Easy To Use & Portable: No more fiddling with complicated buttons. Tumin keeps it simple, yet effective; turn it on, set your volume preference, and you are ready to go! Portable charging case make it easy to carry and can be put into your pocket. Compact & Invisible: Tumin hearing device with nano size can perfectly fit in your ear canal and no burden for ears for long time using. The naked design can be seamlessly integrated with your skin to hide it to the greatest extent. Superior Effective Hearing Assist: Tumin hearing device designed with feedback compression technology to minimize feedback. The sound quality is consistent, long lasting and clear, great ideal for most mild to moderate hearing loss.