Features: brand new and high quality Avoid squealing noise,before wearing a hearing aid, please turn down the volume to the lowest. when wearing, make sure that the earplugs fit tightly with the ear canal, otherwise it will cause interference and howling. then slowly increase the volume as needed until you can clearly hear outside sounds. Lightweight small size , it is easy to carry, the set comes with a charging-case for recharging the device anywhere and any for time,it is powered by most USB devices. Sound adjustment control. you can adjust the appropriate sound level according to the external environment. when you are in a noisy environment, you can feel the external sound by lowering the sound, and when you are in a quiet environment, you can feel the clearer world by raising the sound. Invisible design, the appearance is more fashionable, elegant and slender. wearing it in your ears has a sense of fashion, suitable for the elderly and those people with hearing loss, perfect to help hearing the outside sound again, regaining confidence. it's suitable for all kinds of occasions. Comfortable, invisible ergonomics make you more comfortable to wear,adjustable volume,easy to adjust the volume to meet your needs.Intelligent noise reduction. It can greatly reduce noise, providing high clear sound quality. Specifications: Material:ABS Charging Time: 6 Hours Working Time: 16 Hours Color:Black,Skin,White Note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the pic may not reflect the actual color of the item. Package includes: 1 Pair Hearing Aids 1 Piece Charging for Case 6 Pieces Earplugs 1 Piece Brush 1 Piece Charging Cable 1 Piece User Manual(English)