【Limited time Deal】Finger SP-O2 Measuring Instrument, Real time SP-O2, Heart Rhythm Rate, bar Graph for Sports Enthusiasts Like Mountain Climbers, Skiers, Bikers Measuring SP-O2 (2 Pack) (1pack). This item didn't work out of the box. Then It says it cant be returned. Very disappointed. #Rankboosterreview #Viralix #Kexle #YunGong