Board with a narrow supply and small terminals. When connecting electromechanical ringing 4 jumpers must be preassembled. It is advantageous if the bell wires via terminals in flush-mounted box, etc. can be connected. Otherwise difficult to point requires two people for detention and the port. Difficulty more towards electronic tinkering.
What bothers me the really extremely bright, slightly bluish light (not dimmable, can not be disabled). More an apron lighting as key illumination.
