BTE Wirele Digital Mini Hearing Aid 2 Channel 4 Band Sound Amplifier Open Fit Hearing Amplifier F202 Features 1. No sense of blockage Equipped with advanced anti-howling chip, dare to adopt open-ear design, breathable and comfortable, without any sense of blockage. 2. Powerful battery, easy useA 312 battery, with a large capacity of 160 milliamperes, can meet daily use for 1 week, and can be used continuously for up to 100 hours without shutting down. with Low battery warning function. The battery compartment is also the switch. It is buckled to turn on and pulled up to turn off, which is convenient for battery replacement. 3. Invisible Replaceable thin tube left or right , more comfortable and invisible 4. dolphin design wear it! Just like dolphins leap over your ear 5. basic Intelligent Technology Intelligent noise reduction/Built-in multi-level listening program, one key switch/One-click volume increase and decrease 6.optional technology(difference see the pictures) Intelligent wind noise suppreion system (multi-level optional), Multi-band and multi-channel (multi-level optional) Notice: This Sound Amplifier is suitable for people with mild to moderate hearing lo. 1. Hearing instrument is a kind of electronic devices which amplifies sound from your surroundings. 2. It is used to help hearing Impaired people recover hearing ability by compenating hearing lo. 3. Your MCIC is only one type of hearing instruments. 4. For patients with middle ear infection, it's suggested not to wear hearing Instrument until cured or follow the doctors advice, 5. Please consult your hearing healthcare profeional fist if you have any questions about your hearing Instrument. About howling Howling is a normal phenomenon of hearing aids. please refer to the following tips to try: 1st, choose the earplug head that fits the user's ear canal size (the product is equipped with three sizes of large, medium and small, and two types of earplug heads) 2nd, plug the ear canal tightly without any gaps. If there are gaps or not plug tightly, the product may scream. This is a normal phenomenon of hearing aids. 3rd, as long as the hearing aid is not plugged tightly (closed), the louder sound will produce howling, and the howling can be controlled by turning down the volume appropriately.