NUVU ReVerse - 2-Way Wireless Bluetooth On-Ear Headphones & External Speaker Stereo System - Black BUILT IN 3.7V 1500mAh Li-ion Polymer Battery for up to 8 hours headphone play time, or up to 4 hours speaker play time. CHANGE THE WAY YOU LISTEN TO MUSIC with the 2-in-1 with our built-in volume control & mode selection button to switch from noise cancelling stereo headphones to a super loud speaker system while keeping the same crisp sound quality at any volume MIC INCLUDED + BLUETOOTH SUPPORT to allow you to respond to all your phone calls hands-free without having to take your headphones off Comes with molded carrying case, UL charging plug, USB charging cable, Stereo Cable, User Manual LIFETIME 100% SATISFACTION GUARANTEE: This product is designed to last for years! If you have any issues at all, simply let us know. We'll either replace your order at no cost or issue a full refund