Features： 1、ABS and Silica Gel Material: Made of ABS and medical grade silica gel material, ergonomic design, comfortable to wear and not easy to fall off. 2、Great Performance: This sound hearing device uses imported chip, has superior sound quality and stable transmission, can prevent howlround and reduce noise. 3、Complete Invisible Design: Small size and light weight, comfortable and easy to use. The sound can be heard, shape can not be seen by others. 4、Wild Application: Different sizes of ear plugs, suitable for everyone, this digital sound enhancer can provide you with clear sound and listening experience. 5、Really Helpful: If you find it difficult to hear from others well, a sound hearing device can help you regain your hearing so you can live the life you are used to. Wearing a sound hearing device means rediscovering the joy of getting together with friends and family, feeling more confident at work, and watching movies, music, and TV shows. Specification： Item Type: Sound Aid Device Material: ABS, silica gel Weight: Approx. 225g/7.9oz Headphone Battery Type: Lithium battery (shipped with built in battery) Charging Bay Battery type: Lithium battery (shipped with built in battery) Single Earphone Battery Capacity: 35mAh Charging Bay Battery: 500mAh Frequency Range: 450 to 4500Hz Noise: ≤32dB Package List： 2 x Sound Aid Devices 10 x Ear Plugs 2 x Brushes 1 x Specification 1 x Charging Cable 1 x Charging Bay