2020-12-11 00:00:00 This app provides information of the OSTAR HK-809 heart spectrum blood pressure monitor, information of how to operate the equipment and information of the application for heart spectrum blood pressure measurement. This blood pressure monitor is a personal health care equipment that uses patented technologies such as: heart spectrum technology, automatic correction and calibration technology, etc. to provide blood pressure readings and reference information of the health status of heart. This app also provides information of the patented technologies the equipment used to deliver reliable blood pressure readings and reference indexes of showing the health status of your heart.