Product introduction:1. Ultra-long operation and carefree calling from Bluetooth 4.1: With robust high speed CPU of Bluetooth 4.1 operating system. Acoustic echo cancellation and noise reduction effectively reduce ambient noise while talking， make far-end listener cannot hear what you said become history， just like talking face to face.2. Comfortable wearing: Custom fit supra-aural soft earmuffs， artificial protein leather of earmuffs simulated to human skin texture， ensure long lasting comfort in various rugged circumstances.3. Customized function: Audio Sharing allows you to connect to another headphone via audio cable， share music feast with your friends instantly. Listen to music or enjoy foreign blockbusters， do as you think about it.4. Convenience: Listen to your favorite tracks without using any battery， no matter how long is your playlist. Technical specification:Casque Audio diameter: 8cmBluetooth version: V4.1Operating distance: up to 10m (free space) Standby time: up to 15 daysCharging time: about 2 hourspackage include:1 * Wireless Headset