Refurbished. PRN 50-M GE Automatic zero calibration Display indicators (LED), Power, paper out. PRN50 has number of waveform channels Four max waveform selection: Any monitored waveform. PRN50-M recorder initiation: Automatic from alarm or alarm stacking, manual from bedside or central station Writing method: Thermal, fixed head Writing resolution: 200 thermal elements/in vertical, 480 thermal elements/in horizontal at 25 mm/sec GE PRN and PRN50-M Refurbished Recorder made by GE to connect to patient monitors and Central stations. USOC Medical sell and repair all GE PRN recorder. Contact our customer service for more information