Enabled by the advances CSR Bluetooth 4.0 technology, this Ultra slim stereo headphone boast an unmatched wireless range of up to 33ft, 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, provides effective hands-free solutions for streaming music and answering phone calls. There are 4 buttons including: (1) On/Off button: Power on, (2) Multifunctional button: dedicated to pairing/Radio, (3) Answer/End call button, (4) Volume control and music buttons: short press to “+” “-” volume, long press to Next/Previous track. Bluetooth headset is compatible with virtually every Bluetooth enable devices such as Cell phone/Laptop/ PC/Tablet/TV. – Adjustable headband for perfect fit, Custom fit supra-aural, soft earmuffs ensure long lasting comfort in various circumstances. Folding adjustable design for easy carry.