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This sensor works the same way as an optical mouse, helping your iNAV quad maintain position without GPS! It has a working range of up to 2m, and uses a VL53L0X Lidar rangefinder along with a PMW3901 optic flow module. The sensor is connected to your flight controller via a UART and is currently only supported by INAV - other firmware projects like betaflight will support this sensor in the future.
This is an interesting sensor that will allow you to see your wing's actual relative airspeed rather than ground speed supplied by GPS when used in conjunction with a compatible FC (Matek Wing etc).
The kit includes a sensor, pitot tube and 40cm of rubber tubing.