Supplied to the GP network as the product has received clinical validation; Clinical validation has been conducted by independent clinical investigators, not the manufacturer, to avoid conflicts of interest; Accuracy is tested using established international protocols, such as the ISO 81060-2; Other recognised protocols include those from the European Society of Hypertension (ESH) and the British and Irish Hypertension Society (BIHS) all of which A&D Medical are compliant The gold standard for clinical validation means the device has been compared to manual measurements by two trained observers using a mercury sphygmomanometer and a stethoscope; Results have been published in a peer-reviewed medical journal to ensure the data has been rigorously scrutinised; Clinical validation enables A&D Medical to offer users the same accuracy for blood pressure monitors as your doctor's office 30 memories with average reading function plus carry case and optional AC adaptor (not included); Irregular heart beat detection (IHB) A&D Medical invented and patented the oscillometric technology in 1984, this pioneering technology is now used in all electric upper arm blood pressure monitors ITEMS INCLUDED: 1 x A&D Medical UA-651 portable blood pressure monitor with 1 x arm large cuff (23 - 37 cm), 4 x AA batteries and instruction manual, carry case A&D Medical delivers trusted quality, reliability, and regulatory compliance; Every unit includes a 5 year warranty (excluding cuff and batteries) and is backed by dedicated UK based customer service and technical support