ADVANCED Technology & High-Quality Sound: Bluetooth 4.0 For Steady Bluetooth Signal To Support Connecting Devices Over 33 Feet Away; Rich And Textured Sound As Well As Powerful Bass Reproduced By 40mm Dynamic Driver,Long Battery Life & Dual Mode: Up To 8-12 Hours Of Music Time, With A Cable It Can Be A Wired Headphone Without Battery Consumption ,FAST Charging Time,It Wouldn’t Do If The Battery Life Was No Good; The Nia-X3 Stereo Headset Comes With High Quality Battery That Charges Quickly, We Are Talking An Hour And 30 Minutes. After It Is Fully Charged, You Can Enjoy Listening To Music For 20 Hours Continuously Without A Break.,FUNCTION 4-In-1: Bluetooth Stereo,Tf Card Play,Fm Stereo Radio And Audio Input 4-In-1 Headphones Will Be Your Best Companion For Music, Movie And Games,Portability And Flexibility Ensured By Foldable Compact Design, 90-Degree Ear Cups, Softly Padded Headband And Protein Earmuff For Long-Term Wearing Comfort. (THE Package Excludes Interchangeable Cables), Designed For Maximum Comfort