Bassboomz High Performance Portable Bluetooth Speaker Green Ideal for Smartphones, MP3 players, Tablets, Laptops and any other audio device with a bluetooth connection or via a wired 3.5mm output. Powerful built-in speaker for depth and clarity with advanced wirless audio technology. Built-in Li-Ion rechargable battery giving 5-6 hours useage at 70% volume. Simply twist the Bassboomz to activate and release the Bass Expansion System, delivering an impressive volume-to-size digital amplifier Portable and pocket-sized for your music on the go.