Two modes are adjustable: this hearing aid has two modes, one is the normal mode and the other is the silent mode. The default mode is the normal mode after booting. Smart Noise Reduction: Automatically adjust the sound to a comfortable range to protect your hearing and make the sound more real and sensitive. Reduce the effects of ambient noise Audio interface: with external audio interface, practical audio input, independent volume setting. You can choose suitable earplugs and insert them into the receiver PORTABLE DESIGN: The main hearing aid is 65 37 13mm in size, which is easy to store and carry, suitable for the elderly who want to go out or use it at home High Performance: Our hearing aid is designed with high performance, suitable for people with 120dB hearing loss, intelligent noise reduction and clearer sound