It looks a little weird, and it looks like the first thing that filters the connector. Short, have you guessed it? Interest, yes, it is not a bracelet, it is a watch that uses LED lights to display time. Where does the light shine? (Wakaka) look at the picture solution:
The light is emitted from the small hole, the red light flashing is the hour hand, the yellow light represents five minutes, and the green light represents one minute. After the answer is completed, do you know what time it is showing? This 'block' table is priced at $114.05
Portable Ultrasonic Flowmeter uses the principle of low voltage, multi-pulse time difference, the use of high-precision and ultra-stable double balance signal differential transmission, differential reception digital detection technology, when the ultrasonic beam propagates in the liquid, the flow of the liquid will make a small change in the propagation time, the change in the propagation time is proportional to the flow rate of the liquid.
At zero flow, the time required for the two sensors to transmit and receive sound waves is exactly the same (the only technology that can actually measure zero flow), and when the liquid flows, the transmission time of sound waves in the countercurrent direction is greater than that in the forward direction.
Portable Ultrasonic Flow Meter,Digital Ultrasonic Flowmeter,Hand Held Ultrasonic Flowmeter,Small Volume Portable Ultrasonic Flowmeter
Kaifeng Chuangxin Measurement & Control Instrument Co., Ltd. , https://www.kfcxflowmeter.com