Features: LED fingertip pulse oximeter can monitor blood oxygen saturation and heart rate in real-time. portable. lightweight. and convenient to carry around. Adopting a finger clip design. comfortable and easy to use; The LED display screen is clear and visible. and the data is accurate and reliable; The automatic shutdown function saves power and energy. Using a 32-bit ARMCortex-M0 main control chip with a 48MHz main frequency. strong computing power. and significantly improved performances. Simultaneously measuring blood oxygen saturation and pulse frequency not only displays digital results. but also monitors the continuous waveform of pulse in real-time. This module supports a finger clip shells. making it easy to carry and operate. Specifications: Material: Printed Circuit Board Size: Approx. 51x27mm/2.0x1.06inch Display method: LED monochromed backlights display screen Blood oxygen measurement range: 60-100%. resolution 1% Blood oxygen measurement accuracy: ± 2%. less than 70% undefined Pulse measurement range: 30-250bpm. resolution 1 Pulse measurement accuracy: ± 2bpm%. Power requirements: Two AAA 1.5V alkaline batteries. capable of providing long-term continuous measurement. easy replacement. and low power consumption Package Includes: 1x SPO2-S-LED Health Monitoring Module note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.