The device itself makes a very good impression. Readings are rapidly available, simple operation and brilliant display. However, the included software or the installed device firmware for Win7 (64) is unsuitable. There is no evidence for updates. Device data were randomly displayed only once on the PC. For safety's sake I've tried it yet with the current USB to UART Bridge from Silicon Labs - but without success. I therefore send the device back immediately and will a similar (Finger Pulse Oximeter MD300C316) of Choice Electronic Tech.Co.Ltd order.