The Beurer PO 30 Pulse Oximeter. For measuring arterial oxygen saturation (SpO2) and heart rate (pulse frequency). Simple and completely pain-free measurement; Small and light - for use at home and on the move. Particularly suitable for persons with: Heart failure, chronic obstructive pulmonary diseases, bronchial astmha. Suitable for sports at high altitudes (eg mountaineering, skiing and aviation sports); Easy-to-read colour display with 4 available views; Adjustable display brightness; Graphical display of pulse. Low battery indicator. Automatic switch-off, Includes 2 x AAA batteries and retaining strap for belt pouch. Fully certified medical product. Size H9.7, W13.3, D6.5cm. Weight 0.25kg. Batteries required 2 x AAA (included). Manufacturers 5 year guarantee.