The achievable safety is good, because most code locks have only a built-in outer casing door opener relay. Thus, anyone with a little technical understanding to open the input device (keyboard or reader) and somehow bridge the relay from the outside. Not so with this control unit when it is mounted within the protected area. The input device transmits only the numbers to the control unit, therefore use is a sabotage of Eingabereräts on the outside nothing. The input device can be any Wiegand-compatible device to use (keypad, RFID reader, fingerprint reader). The known in Europe, although hardly anyone, but there are plenty of cheap China units.
Installation was easy, the housing is small and therefore almost be mounted everywhere, though the IR diode should remain visible, otherwise you can not program the device with the remote control.
I use an external power supply with its own relay control, so I changed the sBoard by jumpers on potential free output. The case snaps at four locations on the base, but with a fine blade can withdraw it and open. The jumpers are described in the manual (2-4 must be opened). In this mode, GND is not connected to GND (COM), so you have to connect on the other side for the factory reset OPEN GND.
The device supports up to 1000 users, but I imagine very difficult, because there is no convenient user management. Every new user automatically receives the next free number, who is not so writes down himself, has already lost. But in practice you will probably invest more than a few users. If you need more, will not bother with such a simple controller.
It is handy that users with RFID card and PIN with users can be set up in parallel (without a map). Alternatively, the mode card + PIN or even multi-card is possible.
Overall, a good device for hobbyists who want to build a reasonably secure door control to little money.
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