Product description:<br />Compact、 lightweight and easy to use - can be used by patients. Provides an accurate diagnosis on par with professionals、 clinics and hospitals<br />Quick 30 second single-channel ECG waveform analysis with/without electrodes<br />Presents results with up to 17 different types of ECG waveforms and heart rate display ? Signal amplification (Gain Mode)<br />Easy to read - Large、 high resolution colour LCD display<br />Powered by 2 x AAA batteries (NOT included) with low voltage indication. Auto power-off after 35 second idle time