Voice Amplification Functions: The smart amplifier's auto-fitting algorithm transforms and amplifies the sound, so you can hear sound clear and cooler. Intuitive instructions: Simple, one-touch design makes it easy and easy to use. When you press the button, the color changes to make it easier to see the operating state. Set the tone/volume that you hear best: Each time you press a button, it changes to a tone optimized for your environment. It can be changed to a total of 7 different tones, so you can comfortably hear the sound that's best for you. Supports Bluetooth function: Used 4.2 version of Bluetooth. You can connect to various Bluetooth devices, such as Smartphones and TVs, to correct and listen to the desired sound. Earbuds Upgrade: Upgrade to a white earbud, half-in-ear design, more comfortable and ergonomic, wearing for a long time will not feel pain.