You are here: PRODUCTS / Entry phone / Control units Control units Relax. Our control units know what’s going on inside a building, whether it’s an access system with just a few doors or a gigantic system with thousands of doors. They have dynamic memories, which means you get to choose your priorities. Our control units communicate via networks, modem or GSM. And to just make sure the systems are truly secure, all communication between control units and computers is encrypted. We use 128-bit encryption and two-way communications. Styra AccessoriesYou decide which functions Styra 3000 should have and can freely combine internal and external inputs and outputs. If you want to expand the system with new features, just to bring the desired... Door unitsInstead of pulling the cable from the central to the product, you need to pull Aptus485 bus from the central to the door unit. Then, connect the door environment and its products (eg. Readers, entr... Styra 3000Control unit for access, booking, entrance phone, alarm a… TC 700M RingaMaster control unit for entry phones systems. TC 700S RingaSlave controller for four doors with encrypted communications.