Large Bright LED Display of SpO2, Pulse Rate, and Pulse bar. Low power consumption, automatic power off Small & lightweight design. 2 year limited warranty. Features: Large Bright Display of SpO2, Pulse Rate, and Pulse bar. Low power consumption, automatic power off. Approximately 30 Hour normal operation. Battery-low indicator. Supports 2 AAA alkaline or rechargeable batteries. Accommodates widest range of finger sizes from pediatric to adult. Small & lightweight design ( total 0.09 lbs without batteries ). 2 year limited warranty. Specifications: SpO2-- Measurement range: 70-100% Resolution: 1% Measurement accuracy: 80%-100%; ±2% 70%-79 %; ±3% 0%-69 %;unspecified Pulse Rate-- Measurement range: 30-235 bpm Resolution: 1bpm Measurement accuracy: 30 - 100; ±2 bpm 101- 235; ±2%