Cyber-Blue BSH10 Bluetooth v2.1 + EDR Wireless Behind-the-Head Folding Stereo Headphones w/Microphone (Black/Silver) Cyber-Blue BSH10 Bluetooth Stereo Headphones General Features: Black and silver color Behind-the-head stereo headphones Foldable design provides maximum portability Compliant with Bluetooth v2.1 + EDR Class 2 Up to 30-feet (10 meters) operating range 2.4 - 2.480 GHz radio frequency Features CVC software echo and noise cancellation Built-in Li-Polymer rechargeable battery