Ortofon Concorde DJ S RiotSound Battletec - Limited Edition - 2X DJ Cartridges - includes 2 additional styli Individually numbered, hand-printed custom sleeve and limited to just 20 units Includes certificate of authenticity signed by Ortofon CEO Christen H. Nielsen and RIOTSOUND President Alex Shtaerman Output voltage at 1000 Hz, 5cm/sec: 6 mV Frequency response: 20-18.000 Hz + 3 / - 2dB Stylus type: Spherical