Features: 6-button operation and bright LED displays Durable unit is simple and small easily slides into a pocket Up to 100 patient information and 72 hours record storage Visual & Audio alarm for SPO2,pulse rate, sensor off Data transmission function (optional) 4 AAA alkaline or rechargeable batteries SPO2 ,pulse rate and bar graph display No periodic maintenance or calibration required Used in most any clinical setting Standard Accessory: SpO2 reusable sensor for adult SpO2 extension cable 4 AAA Alkaline batteries Operating manual Optional Accessory: Data transmission software