Tonium P666 Pacemaker Pocket-Sized DJ System, 60 GB Portable DJ system lets you mix, play and perform music anywhere, anytime 1.7 inch TFT Display with 166 ppi screen resolution 60GB Harddrive-holds approximately 15,000 tracks in 128 Kbps AAC format Built-in rechargeable lithium battery, play time up to 15 hours when fully charged, mix mode up to 5 hours when fully charged USB 2.0, Pacemaker editor computer software, quick start guide included in the box