NAXA Electronics NE-942RD Bluetooth Wireless Stereo Headphones with Microphone Wireless over-ear headphones with built-in microphone and Bluetooth&regtechnology Enjoy music wirelessly from smartphones, laptops, tablets, and other Bluetooth enabled devices Built-in microphone allows you to take and make hands-free calls from a connected smartphone Rechargeable lithium battery provides up to 4 hours of music play time or 10 hours of talk time Power:Rechargeable battery