The HMDX HX-HP420 Jam Transit Bluetooth Headphones with Microphone offer a convenient and stylish way to enjoy your favorite tunes. They pair with a compatible smartphone within a range of 30' for wireless streaming as well as taking calls for hands-free conversation. The controls are located on the side for convenient access. Precision drivers deliver deep bass for powerful sound output. These Jam Transit wireless headphones also run for up to 11 hours on a full charge and are available in a selection of colors. HMDX HX-HP420 Jam Transit Bluetooth Headphones with Microphone: Bluetooth technology Precision drivers for superior bass Integrated microphone for taking phone calls Wireless up to 30' HMDX HX-HP420 Jam Transit Bluetooth headphones offer up to 11 hours of wireless play Rechargeable li-ion battery Conveniently located controls Specifications Features: Comfortable Rechargeable Battery make / manufacturer: HMDX AUDIO model name / number: Jam hx-hp420 size / dimensions: 8.00 x 6.25 x 2.50 Inches