ZEALOT B17 Bluetooth4.0 Headphones Wireless Portable Hand Free with [Built-in Mic] [FM Radio] [Micro SD Card Play] [Noise Reducing] [Foldable] (Red) Crystal clear and full-range sound let you feel the music coming with details realized through B17 40mm dynamic neodymium speakers with Bluetooth4.0 and DSP noise reduction. Up to 8-10 hours Bluetooth phone call and music time powered by 600mAh rechargeable lithium-polymer battery. Perfectly connect all Bluetooth devices and stable to do transmission within 10m range with auto connect function after 1st connection, making sure your Bluetooth conversation very clear like face to face Perfectly connect all Bluetooth devices and stable to do transmission within 10m range with auto connect function after 1st connection, making sure your Bluetooth conversation very clear like face to face. Comfortable wearing: artificial soft leather earmuffs friendly to skin touch like huddle for ears for long lasting comfort indoors or outdoors Full package with Built-in microphone, FM radio and MP3 player via TF card functions.