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✅Easy to Use - Our Heart rhythm moniter has an efficient One-Button operation that can check and display in real time SP-O2, Heart rhythm rate, Heart rhythm bar graph. ✅Clear LED Screen Display - Large font, high definition, the elderly can also clearly see.It requires 2 AAA batteries. Due to transportation requirements, the product does not include batteries. ✅SPORT/HEALTH ENTHUSIASTS - For sports enthusiasts like mountain climbers, skiers, bikers or any sports enthusiasts interested in measuring their SP-O2 and Heart rhythm rate. ✅ACCURATE, RELIABLE, & QUICK READINGS | Clinically tested and proven consistent results. Receive SP-O2, Heart rhythm Rate, and Heart rhythm Strength results within 10 seconds on large digital LED display.