Features - Patented automatic 4-way screen orientation - Low Power consumption; - Low Perfusion ? 0.4%; - Portable, Small and light weight; - Durable and fashionable design: Vacuum-galvanization and UV printing technology Technical Specification - Display type: OLED two color display; - Measurement range: SpO2 from 70% to 99%,PR from 30 to 240 BPM; - Resolution: ±1% for SpO2, ±1BPM for Pulse rate; - Accuracy: ±2%(70%-99%), unspecified(?70%) for SpO2; - Alarming Default Value: Pluse rate?110bpm, SpO2?85%; Upper limit setting range:100-250bpm, lower setting range:15-95bpm; - Low perfusion: ?0.4%; - Power supply: Two of 1.5(AAA Size)alkaline batteries; - Power consumption less than 30mA; - The product will automatically power off when no signals after 8sec; - The product power on automatically when have signals.