Obvious.
In both cases the device unlocks the passenger side door and appears to disable the alarm system.....
On many systems, unlocking the door with a key activates the central locking and disables the alarm. This is certainly true of "two button" Bosch systems and probably others as well. Coded negotiation between the fob and ECU is only necessary to disable the immobiliser. It sort of makes sense, you don't want the alarm going off if you've unlocked the thing with the correct key.
My guess would be a box of tricks that manipulates the solenoid on the lock, tricking the system into believing the door's been unlocked with the key.