Enabled by the advanced csr Bluetooth 4.0 technology, the stereo headphones boast an unmatched wireless range of up to 33 feet, built-in rechargeable li-ion battery charges quickly in 1.5 hours and provides playback for 6 hours and up to 30 hours of standby time Fully charged the battery before using it the first time, built-in microphone and in-line control provide effective hands-free solutions for streaming music and answering phone calls There are 4 buttons including an on/off button, multi-functional button, answer/end call button and a volume/music button, Bluetooth headset is compatible with virtually every Bluetooth enable devices such as cell phones, laptops, pcs, tablets and tvs Can be used as a wired headset as well with the provided 1.5m audio cable, enabling you to listen to music without using the battery, perfect for use while working out, enjoying your favorite sport, relaxing at the beach, between meetings for work or waiting at the doctor's office Built-in rechargeable li-ion battery charges quickly in 1.5 hours and provides playback for 6 hours and up to 30 hours of standby time, fully charged the battery before using it the first time Built-in microphone and in-line control provide effective hands-free solutions for streaming music and answering phone calls There are 4 buttons including an on/off button, multi-functional button, answer/end call button and a volume/music button