JouerNow RUD003 Portable Music Instruments, Battery & USB Powered Digital MIDI Electric Roll up Drum Set with Built-in Metronome & Speaker / Foldable Silicon Hand Roll Drum, 7 pads &#9835 High-quality Built-in Dual Speakers: bring you astonishing bass effect, no need to connect with other speakers, CONVENIENT. &#9835 Extraordinary Druming Fidelity: 7 Professional tritone standard drum pads with drum bit swap & pedal function, assure you a maximun verisimilar & dramatic drum-playing acoustic sensation. &#9835 Multifunctional USB MIDI/Micro Jacks: can be simultaneously powered & connected with computer/ laptop/ tablet PC/ mobile phone to charge or play computer drum games. &#9835 Tempo-adjusting & Style-switching: with Built-in Metronome basic functions & different styles of Drums programmed in, Pop/ Rock/ Latin/Electronic Styles are all available. &#9835 A fun must-have for drum-players: battery-powered & with external headphone output, you can immerse in your music world without disturbing others, play anywhere anytime.