Sorry, still don't understand how it works and the power supply: do I need two of the parts that create a kind of radio barrier between them? And how are they powered, do they have built-in rechargeable batteries or do they need batteries? Thanks in advance for short feedback.

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Accepted Answer

One lock is enough to cover an area, either around e.g. food bowl or shoes or as a line to lock a room or area, 2 devices therefore 2 x lock. 
There is no battery. Each unit requires 2 x AA batteries. These last a very long time, unit glows when batteries are empty.

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Question about iRobot Roomba Dual Mode Virtual Wall® Barrier 2 Pack

Sorry, still don't understand how it works and the power supply: do I need two of the parts that create a kind of radio barrier between them? And how are they powered, do they have built-in rechargeable batteries or do they need batteries? Thanks in advance for short feedback.