Features1NICE FIT: The sound aids are made of medical grade silicone material, have an ergonomic design, and have a good fit with ears, not easily removed. 2 SIGNAL TRANSMISSION: The use of chips results in good sound quality and stable transmission of hearing aids. Reduce noise and stop squeaking. 3CONVENIENT USE: The sound amplifiers are compact and light, so they are not only provide outstanding sound, but also easy to wear. 4LIFE ASSISTANT: If you have trouble hearing others speak, a sound amplifier can help you regain your hearing and lead a normal life again. 5WHERE IT APPLIES: Wearing a sound amplifier means rediscovering the delight of socializing with friends and family, feeling more assured at work, and enjoying movies, music, and TV shows more.SpecificationItem Type: Rechargeable Sound AmplifierProduct Material: ABS, SiliconeHeadphone Battery Type: Lithium battery (shipped with built in battery)Battery Type of Charging Bin: Lithium battery (shipped with built in battery)Battery Capacity of Single Headset: 35mahCharging Compartment Battery: 500mAhFrequency Range: 300 to 3800HzNoise: Less than or equal to 30dBPackage List1 x Sound Amplifier2 x Earplug1 x Brush1 x Screwdriver1 x Adapter Port1 x Manual1 x Charging Cable1 x Charging Bin