Painless & non-invasive oximeter tells you in a loud, clear audio transmission what your current pulse rate and oxygen saturation levels are. Ergonomic design with easy to read led display shows your pulse rate, oxygen level and low battery indicator. Compact 2 size runs on 2 batteries available everywhere. Features: *30+ hours continuously monitoring on one set of batteries *integrated spo2 probe and processing display module *talking (oxygen level... , pulse rate... ) *spo2 and pulse rate bar graph *bright led display *low battery level indication *auto power off after 5 seconds 8low power consumption on 2 aaa batteries *interference resistance capacity against ambient light and measurement performance at low perfusion *comes with 2 batteries and hanging strap