Matek Micro Optic Flow and Lidar SensorThis is a small and affordable way to add position hold functionality to your UAV without the need for GPS. It has a working range of up to 2m, and uses a VL53L0X Lidar rangefinder along with a PMW3901 optic flow module. It connects to your FC via UART and it currently supported only by INAV, but other firmware projects like betaflight will support this in the future. Specifications Brand Name: Matek System Item Name: Optical Flow Lidar Sensor 3901