Miniature Hearing Aid: Mini, light, the product size is about 22.1*9.9*mm, the ear capsule is very small, almost disappearing in your ear, comfortable to wear and easy to carry. Bluetooth function: It can be connected to computers and mobile phones to enjoy wonderful sound. Charging function: the hearing aid can be charged by USB cable, the battery can run continuously for about 20-28 hours after fully charged, it is environmentally friendly. Save you the hassle of buying button batteries all the time. Special Features: This hearing aids feature full digital sound quality for low audio distortion and clearer sound. It also has a noise canceling feature that helps users hear sounds with maximum clarity. It features fully digital circuitry and adjustable volume control. Contactless power on and off: Put it in the charging box to shut down, leave the charging box to power on, and automatically save the program mode when the power is off.