ULTRASOUND ACS SENSOR KIT FOR WORX LANDROID ROBOT Lawn Mowers - the ultrasonic anti-collision technology allows each Landroid Robot to dodge any obstacle that is at least 5 cm wide and 7 cm high - applying this fantastic and very useful sensor to your Landroid Robot is very simple: 1) Remove the top cover 2) Connect the ultrasonic sensor to the Landroid Robot 3) Use the appropriate screws to secure everything FEATURES Obstacle detection: minimum 7 cm height x 5 cm width Obstacle detection distance: 0 - 20 cm Fits Landroid models: WR130E, WR141E, WR142E, WR143E, WR153E, WR155E CODE: WA0860 CZ