Can you tell me what's the difference of PPG bomb between b840 and b 810?

你能告诉我b840B810的PPG炸弹有什么区别吗？

PPG Industries, a  Fortune 500 company and paint supplier, also managed improved sales in the second quarter.

财富 500 强公司供应商 PPG Industries 第二季度的销售额也有所改善。

We won't get into too much detail as to how it works, but by emitting green light, the watch's optical PPG sensor tracks blood circulation of your wrist, which outputs data to measure a little thing called your heart rate.

我们不会详细介绍它是如何工作的，但是出绿光，手表的光学 PPG 传感器跟踪你手腕的血液循环，输出数据来测量一个叫做心率的数据。