SainSonic R9 Bluetooth V4.1 Sports Headphone offers you an amazing HD and stereo sound effect to enjoy music while doing outdoor activities such as running, jogging, hiking, cycling and so on. It is fully compatible with any Bluetooth-enabled devices with its latest Bluetooth V4.1 technology. Small and lightweight with ergonomic design, it is very easy to pair and very comfortable to wear. High quality rechargeable Lithium battery provides you up to 6-hour Talk/Play time for long use. It is very easy to implement various remote controls of your smartphones by pressing the multifunction button. Specifications Bluetooth Version: V4.1, Class 2 Charging: Power Adapter Output (DC5V/150mA) Battery: High-capability Rechargeable, 160mAh Lithium Polymer Battery Profiles Supported: Headset / Handsfree / A2DP / AVRCP / CVC Noise Cancellation 6.0 technology Talk-time: Up to 6 hours Play-time: Up to 6 hours Standby-time: Up to 180 hours Package 1X SainSonic R9 Wireless Earphones 1X Micro USB Charge Cable 2X Extra Earbud Tips (S/L) 1X User Manual 1-Year 12 months from the date of first purchase, provided that the machine has been used appropriately, which ensures the least worries and best experience that we could provide for our dearest customers.