1?Features ? AECG-903 Digital Holter Recorder is a three-channel, seven-lead solid-state device designed for 24-hour continuous recording of ambulatory ECG data. Its nonvolatile, removable, digital storage and rugged compact design ensure reliable operation and long life while its light weight enables patient comfort during daily activities ? Compatible with many kinds of holter software scanning ? PCMCIA flash card ? Through LED direct to begin and write down information ? Escape circuit of libration ? Dimensions: 128mm*68*mm*24mm ? Use AA of alkalescent batteries ? Safeguard circuit to be fit ? Event button ? leads color electrical wire ? ECG channels: 3 channels ? Resolving power: 8 bit ? Frequency: 128Hz ? Manner: Full-information without compressing ? Time: 24 hours