Features: Portable and easy to operate Full-color OLED display Advanced measuring technology provides steady and accurate ECG waveforms Analysis and report 17 types of suggestive results PC data management software for data transmission and analysis Chest lead & limb lead measure available. Specification: Technical Specifications Display Mode: Color LCD display Resolution: 240*160 Screen Size (mm): 40*57.6 Signal Input: Single embedded metal electrodes or external lead wire Lead Selections & Measuring Modes: Quick measurement by embedded electordes; Measurement by external electordes with lead wires (single channel for Lead I II or III) ECG Bandwidth: 0.05-40Hz (Enhanced mode), 0.5-40HZ(Normal mode) Internal Noise Level: 30uVp-p Heart Rate Range: 30-240bpm Heart Rate Accuracy 2bpm or 2%which ever is greater Display Scale: 5mm/mV 10% CMRR 60dB Wave Form Sweeping Speed: 20mm/s10% Measurement Time: 30 seconds per test Suggestive Results: 17 types of waveform Dimensionsmm: L125*W70*H21.5 Net Weight(without Batteries) : 106g Power Supply: 2*AA batteries(not include) Voltage: DC 5.0V/1.0A Packing List: 1 x Machine main unit(without battery) 1 x Velcro storage pouch 1 x English user's manual 1 x Data cable 1 x Data Manager software CD