Features: 1. Retractable Unique Design: The Bluetooth-compatible Headsets body can be clipped on clothes or collars.When you need Stretch the earbuds in-ear.When you don't need Take out the earbuds and Press rewind button The earbuds are retracted Release the pressure of ear. 2. Smart Function: Our Headsets with mic supports SIRI voice prompt. One key to power on and enter pairing mode 1 to 2 connection. 2 hours quick charge 10-11 hours working time. With 33ft (10meters) working range. Voice announce the phone number of income caller one key to answer reject end and redial the last number. 3. Crystal Clear Sound: Noise Reduction boom microphone and Dynamic Speaker broadcasts your speech clearly when you move around and perform your tasks while having a phone conversation or speaking to a crowd. 4. Univeral Compatible: V5.0 Wireless Earphones supports Calling and Music Playing function easy and fast pairing with smart phones and tablets. 5. After-service: If you have any questions after receiving the product please feel free to contact us and we will provide you with a satisfactory answer. Specification: Bluetooth-compatible Version: 5.0 Transmission Range: 10m Transmission Frequency: 2.4GHz Charging Time: 2h Use Time: 10h Standby Time: 150h includes: 1 * Earphone 1 * Charging Line