Put a couple of IR LEDs on the cat blipping out a signal for the rover and have it follow the cat around ALL DAY!!! Then when the batteries run down, since it's got the house mapped, it can find it's way back to the charging station where it doesn't plug into anything...it 'hovers' over a charge transfer coil (magnetic recharging?)...waits until it's recharged. When it's recharged, it looks thru its map (all the while it's been chasing the cat, it marks where the cat has been the most), goes to the spot or area where the cat usually hangs out and then POUNCES on the cat!