Venstone Bluetooth Headphones Build in Microphone Wireless Headphones with TF Card FM Radio and Extra Audio Cable for Most Cellphones Laptop TV Bluetooth 4.0 Devices (Red) Enabled by the advanced CSR bluetooth 4.0 technology, the stereo headphones boast an unmatched wireless range of up to 33 ft, built-in rechargeable lithium ion battery not only charges quickly(1.5 hours), but also enables a remarkable playtime of up to about 6 hours. 30 hours standby with a single charge. Built-in microphone and in-line control provide effective hands-free solutions for streaming music and answering phone calls. There are 4 buttons including:(1)On/Off button:Power On (2)Multi-Functional Button:Dedicated to pairing/Radio (3)Answer/End call Button (4) Volume control& Music buttons: short press to"+" "-" volume, long press to Next/Previous Track. Bluetooth Headset is compatible with virtaully every bluetooth enable devices such as Cell Phone/Laptop/PC/Tablet/TV. It is not only a bluetooth headphone, but also a wired headset, just a plug with audio cable(1.5m audio cable is included), then listen to your favorite tracks without using any battery. Perfect for use while working out, enjoying your favorite sport, relaxing at the beach, between meetings for work, or waiting at the doctor&#39;s office. Adjustable PU leather headband for perfect fit. Custom fit supra-aural soft earmuffs, artificial protein leather of earmuffs simulated to human skin texture, ensure long lasting comfort in various rugged circumstances. Folding adjustable design for easy carry.