* FDA Approved * Light weight  only 50g with batteries * Low power consumption less than 30ma two AAA batteries can be continuously operated for 30 hours * Six display modes  signal strength shown by bargraph * LCD display * 1 year limited warranty * Range: 0%-99% * Resolution: 1% * Accuracy: 80% - 99%: +-2% 70% - 85%: +-3% 0% - 69%: unspecified * Pulse Rate Range: 0-254 BPM * Resolution: 1bpm * Accuracy: +-2bpm or +-2% *