I am a physician. I purchased the Emay Portable Handheld Monitor after reading the various postings by customers and it is a really cool device. It is small and can be transported easily in my purse. The software comes in a flash drive and a USB cable is provided to upload data to a Windows PC. The device gives good quality tracings, particularly with lead I (held between the left and right palm). The default recording is set to 10 seconds, which is too short to monitor for an arrhythmia. I changed the recording time through the software on a PC to 30 seconds (which is the maximum). It was able to detect skipped beats and indicate whether the heart rhythm was too fast (tachycardia) or too slow (bradycardia). A user with medical experience can view the onscreen tracing and interpret arrhythmias (irregularities in heart rhythm) on the fly. The device analyzes the data and labels abnormalities on the device itself. According to the user manual, it can identify various irregularities in heart rhythm including “missed beat, ST elevation, VPB bigeminy, bradycardia, ST depression, VPB couple, tachycardia, accidental VPB, VPB runs of 3, arrhythmia, VPB trigeminy, runs of 4.” The user manual FAQ response indicates that the device labels the tracing of atrial fibrillation (a common and dangerous rhythm) as arrhythmia. The user can download the data and print it out to share with their healthcare provider. For me, the most important use of this device is as a guide of when to head immediately to the emergency room—if VPB bigeminy, VPB couple, VPB runs of 3, arrhythmia, VPB trigeminy, runs of 4 are recorded.