Expensive waste of money, EXIT ONLY!
I purchased and installed this product at great personal expense, expecting that it would be able to control exit and entry to my house for my cats, some of whom have different medical needs. I expected to be able to determne which cats are allowed to exit or enter the house. However, this product only allows EXIT ONLY mode - which means that a female cat in heat, for example, is free to come and go as she pleases.
There is a manual mode, but it rather defeats the purpose. Do not reccommend.