The SHO-FLOW® 1 Bluetooth® has no wires to connect and no batteries are needed. The flow meter has an unobstructed water driven turbine that passes debris up to 1” (38 mm) in diameter. Staring at a flow rate of 50 gpm (200 l/min), the water driven turbine self generates power to create a Bluetooth connection to any smart device that displays the flow rate in real time. The flow rate is user specified in GPM, l/min, or l/sec. The SHO-FLOW® 1 Bluetooth® App is available to download for free through Apple or Android app stores. The app allows user specified flow rates, calibration, and diagnostics.