Yes, additional units can be purchased. But it is quite complicated to connect them. I only have one extra unit and it's difficult to reconnect them every time I only use one. But according to the statistics, this device has the fewest rays of all

One. Additional ones can be purchased, up to 4 of them can be connected in total. But don't bother. In my opinion, the device is not worth the money. Cheapest electronics and hardly repairable.