Specifications Optical Flow: PMW3901 Lidar: (max. range 2 m) Interface UART Protocol: MSP Working Range: 8cm~200cm Field of view: 42 degree(PMW3901), 27 degree() Minimum Illumination 60Lux Input voltage: 4.5~5.5V Power Consumption: 40mA Material: Metal + Plastic Color: As shown Tips Make sure Optical Flow lens to ground 2cm for opflow initialization while FC starting up. Maximum range of is 2m, Altitude hold 0~2m @ throttle 0~100% if is enabled. Any UART of FC supports it Sonar connection (Trig & ) has not been implemented If your flight controller doesn't have a barometer detected, you 't be to select "NAV ALTHOLD" in modes tab. Package Contents: 1 x Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.