【Reliable & Accuracy】- Oudekay electronic upper arm blood pressure monitor has advanced measurement techniques,along with World Health Organisation (WHO) Blood Pressure Classification Indicator to give you the most accurate reading, which is essential to manage high blood pressure.Powered by 4 x AAA batteries (included). 【Large Screen Tricolor Backlight Display】- Easy-read backlight screen with extra-large digits and tricolor-colored LCD indicator lights to show your readings to the monitors the results clearly. The green means normal, the orange means a little high and the red means high,especially easy for the aged to read. 【Two-User Mode】- The blood pressure monitor supports two user mode, can store up to 198 sets of data (99 readings for each user). Automatically displays the average of your last 3 readings. Helps users to easily track their health, blood pressure and heart rate according to the specific time and date.Its measurement stability is superior to wrist one. it is more suitable for patients with older age, irregular heartbeats, and peripheral blood vessel aging caused by diabetes. 【Adjustable Comfortable Cuff】- With 22-42cm(8.7 - 16.5in) large cuff,this blood pressure monitor fits most people within the accepted range especially larger arms and has very strong velcro around the cuff to secure it around the arm. No replacement cuff needed. 【After-Sale Service】- We provide friendly customer service, If you have any problem, Please contact us our customer service team by email ,Our team will provide 24-hour service.