Not very accurate. Its principle is to infer the blood glucose value through the composition of body fluids. In the following years, there are similar bracelets and watches launched by merchants one after another. According to the introduction, its principle is to monitor the flow of subcutaneous fluids and convert them into calorie data, and then derive the blood glucose value through a special calculation method.
With the above information, there is no way to know whether these principles are scientific, but what is certain is that the blood glucose values derived from devices that non-invasively test blood glucose are speculative, rather than direct measurements of the actual amount of glucose in the blood.