Scarlet TWL-1S Real Time Demo - Video
In this demo the wind cup is rotated to change the reading of wind speed and the iOS app (installed on iPhone 6s plus) responses in real-time. And then I press mode button of TWL-1S to show each parameters and compare the readings on the app. The Bluetooth LE module is installed inside the TWL-1S. The cable you see in the video is for power only.