Features: Comes with rechargeable function, no need to change battery. Combines a cosmetically attractive look with the smooth sound and an internal speaker. Filter out unwanted noise caused by airflow or wind. Deliver instant, powerful, and smooth sound right into your ear. Moisture resistant offers durability to most forms of moisture and wear. Separate wire and headphones, more convenient and safety. Provide improved technology for less electromagnetic interference. Suitable for severe hearing loss people. Smaller than a credit card, discreet enough and easily fits in your pocket or handbag.