The listing, CONTEC MED CMS50NA Pulse Oximeter, Blood Oxygen Saturation Monitor … (Gray) has ended.
Shipped from Amazon for free directly to you.
Amazon's Descriptions:
NOTE: this product is intended for sports and aviation use only and is not a medical device.We are the direct manufacturer, there is a clear screen protector which can be removed before use.
Dual-color display (blue and yellow), the dispaly mode can be changed.
Display of SpO2, PR, bar graph and pulse waveform.
Low battery indication. Easy to use, accurate oxygen measurement.
Sports and aviation use only . Power supply: two “AAA” batteries(Batteries not included due to shipping reasons)