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Our hearing amplifier is convenient and durable to wear. It runs with high quality rechargeable lithium battery Its great battery runs around 20-24 hours continuously after fully charged. It can be charged via USB cable. Frequently Asked Questions Question one: Why there is the whistling sound? Answer: 1. The ear plug is too small. 2. The ear plug is not really inserted into the ear canal. 3. The sound tube isn't connected tightly with the ear plug. 4. The sound tube isn't connected tightly with the ear hook. Question two: Why there is noise? Answer: If you hear noise it may be the sound of the current which needs time to adapt to please understand. If you increase the volume the sound of current will also be increased more obviously like the sound of wind. If it still can not help please try to switch the programs. Generally it takes 20 -30 days to get used to the sound. Please try to adapt to it. If you cann't our quality commitment is s Hassle Return policy 1 year on hassle !. Warm prompt: When you first use this product please charge the batter fully. Please turn off the power before assembling the hearing aid. Package Includes: 1 Banglijian Hearing Amplifier 1 Shockproof Case 3 Ear Plugs 1 Sound Tube 1 Cleaning Brush 1 Power Adapter 1 USB Cable 1 User Manual