1?Features ? The Holter Recorder is designed for 24/48 hour continuous recording of ambulatory ECG, it is 302*240 dots Large LCD and 12 channel, 10 lead solid-state device ? Recording Channel: I?II?III?AVR?AVL?AVF?V1?V2?V3?V4?V5?V6 ? LCD Display:12-Lead or 1?3?6 Channels ? Impedance measurement ? Measure grid display on or off ? Gain: 1/2?1?2Mv ? Speed: 12.5?25?50 mm/s ? Buttons: freeze button?LCD display button?event button ? LCD resolution: 320*240 dots