Thanks for looking… I have available this little iRobot Roomba Virtual Wall / Lighthouse unit. Just insert 2x AA batteries (not included). Turn on and pop down to create an invisible barrier. This stops your Roomba straying into areas it’s not wanted. Also a feature that creates a no-go zone around the little unit. In great working order. Compatible with iRobot Roomba 800 & 900 series. Any questions, please shout
eBay