Cardo S-800 Bluetooth In-Ear, Over-the-Ear Headset Fits comfortably and securely in the ear and can also be worn with an earloop (vertically and horizontally adjustable) Embedded audio balancing with noise reduction technology and a high-end speaker booster provide superior voice quality and volume Dedicated button to quickly call any of your three favorite numbers SWAP technology lets you toggle between two active phones Up to 8 hours of talk time and up to 7 days (168 hours) of standby time