Kospet Brave, how to calculate Blood Pressure?

I am trying to write a new Android User Interface for the Kospet Brave for a company project, and I cannot decipher how to read the Blood Pressure. Is there an SDK or something else I can use to get the Blood Pressure value?

I looked at the firmware, but I do not see any source code.

Thanks.

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Mr. Ticks has this video that explains basically how it works. Its at the 20:30 point in the video. Unlike some fitness bands that measure from two points, electrical and heart rate sensor, this watch only uses the heart rate sensor.

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Thank you for replying, but I already know how to use the watch. My question was how to calculate the Blood Pressure from the raw sensor data. As I was saying, I am trying to write a new interface for it for a company project. Is there an SDK for this watch that I can use?

Thanks.