Specifications: We manufacture and supply handheld pulse oximeter for veterinary use. Contact us for details. SpO2 Measurement range: 0-100% Accuracy: -2~2% during 70%-100% -3~3% during 60%-69% Pulse Rate Measurement range: 30bpm-400bpm% Accuracy: 1 bpm or -2~2%. Take the bigger one Visual Displays and Indicators: SpO2 % display: Red LED. Variable brightness Pulse Rate display: Green LED, variable brightness Pulse intensity: Red LED 8 bars Power Indicator Light: Green; Normal Low Power voltage: Red and Blink Low perfusion indicator: Red bar Audio Indicator: Probe off audio indicator (every thirty seconds) Pulse audio indicator Key-pressing indicator Low power voltage Power Requirements: Four standard "AA"size alkaline batteries Battery Life: Twelve Hours Gross weight: 480g