Rokit Boost SwageU Black Bluetooth Headphones with Built-In Microphone, Music and Hands Free Calling - Black IMPORTANT NOTE: Please download the manual below the product details to know the working functionality of the product. Enhancements: EQ for better sound control. Memory flex neck strap. Support handsfree dialing e.g. Siri... SwageU Bluetooth Headphones sports premium comfort with lightweight and trouble-free, magnetic earbuds, wearable design. Reliable wireless pairing provided by Bluetooth Version 4.0 technology SwageU Bluetooth Headset comes with a Built-in microphone for easy, hands-free communication . 8 hours playback time.100 hours standby time. Multipoint HFP Connection to 2 Mobile Phones simultaneously.