Compatible with ALL3418v2/3419/3500/4500/5000. 1-port contact input module in housing. Connection of one (potential-free) contact. Open contacts are counted as "1", closed contacts as "0" - ideal for example for standby loops (door contacts) with impulse extension. A suitable patch cable in your desired length is also required for operation with the central units. Note: not compatible with the old series ALL3000/4000. The ALL4440 is an I2C single-contact input for the ALLNET MSR series of generation 2 (ALL3418/3419/3500 etc.). The ALL4440 has 2 connections: 1x RJ45 I2C interface, where you can connect a suitable patch cable in your desired length (not included). On the other side, you can connect optional door contacts (ALL3041) via the vibration alarm (ALL3044) up to the shock sensor (ALL3043) using the green 2 pins.