Esperanza ECO001 pulse oximeter Black

Accuracy: 2 bpm Pulse rate measurement range: 30 - 240 bpm Display: LED Product colour: Black Oxygen saturation measurement range: 35 - 100% Battery voltage: 1.5 V Battery technology: Alkaline Power source type: Battery Number of batteries supported: 2 Battery type: AAA Operating temperature (T-T): 5 - 40 °C Operating relative humidity (H-H): 30 - 80% Warnings: Store in a dry place to prevent damage.