Lub A20-module yog raws li kev siv lub kaw cais dej sojntsuam.Ultrasonic sojntsuam txais kev tiv thaiv dej thev naus laus zis tsim, txo qhov teeb meem ntawm kev sojntsuam condensation, IP67 haum rau qhov chaw hnyav.
R01 module yog ib tug me me waterproof laser range sensor nrog sab hauv tsev ntau yam ntawm 2-400cm.