1. Either the ear hook or the ear pulg.
2. Support bluetooth headset,handfree profile
3. Keep your conversation crystal clear
4. Working with most bluetooth cell phone
5. Redial the last call ,Reject call.
6. Volume adjustable.
7. LED indicates connection.
8. Faster connecting, clear sound, anti-interference
9. Over-the-head Design
10. Noise canceling crystal clear sound