Beyution New Sports Hi-fi Bluetooth 4.1 Headphones - Mini Lightweight Wireless Stereo Sports/Running Bluetooth Earbuds Headphones Headsets Built in Mic-Phone (508s-v4.1-Green) New HiFi Wireless Bluetooth V4.1 Headphone Headphones headset for Cell Phone/Laptop/PC/Tablet HiFi - Best Audio Performance - Stereo - Sports - Wireless Bluetooth V4.1 Version --33 feet distance - Over the head Built-in microphone and Noise cancellation technology; Allows clear Phone communication; Enables use as a headset. Music and phone controls ensure ease of use Built-in rechargeable lithium-polymer battery With Li-battery enables up to 8-9 hours of talk time or audio playback, Standby time up to 250-300 hours. Design that fits comfortably and stays for Walking and Sports Running