Channel 2 NorthStar® Navigation Cube for Braava 380t can be used as a replacement cube for Braava 380t.
A must have accessory for homes with many rooms or some large space. It will connect seamlessly between the navigation cubes and save you the need to pick up the iRobot each time and readjust. But please make sure the channels are not the same , for it to work. The downside is high battery usage ( try get rechargeables)