Upgraded Hearing Aids without Squealing: Compared to other hearing aids in the market, our product completely solves the problem of squealing when wearing them. The upgraded design of the hearing aid separates the receiving hole from the speaker to avoid a sound return, thus no whistling happened. This hearing aid is a great choice for mild to moderate hearing loss. 40 dB sound gain is higher than most other hearing aids. Never missing out on conversations with friends and family. Intelligent Charging Case With Power Display: Our rechargeable hearing aids combine fashion and functionality with a running light design.