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It can be powered by 5V battery power supply or lithium ion battery
Please observe correct polarity as printed on the back of module:- IN+
Long-distance wireless transmission (1000 m line of sight with baud rate 5000 bps)
Pin 7 - ISO 9141-2 K Line
1 x Circle Horn
TDS (Protect power circuit ) Water Sensor (1 Meter Probe) KEYSTUDIO 3 way corner connector It can be powered byTDS (Total Dissolved Solids) measures how many milligrams of soluble solids dissolved in one liter of water. The measure is expressed in PPM (part per million). In general, the higher the TDS value, the more soluble solids dissolved in water, and the less clean the water is. Therefore, the TDS value can be used as one of the references for reflecting the cleanliness of water. Thanks to this product, it becomes possible to create your own measurement,