The I3FDI keypad can access the opening of one or several doors. It contains two wires to connect to the lock, two wires to connect to the power supply, and two wires to connect to the push button. This device is built in a six of 135 mm x 100 m x 43 mm. The digital 22 resident codes of 3 to 8 digits and the two door relays NO / NC are also included. Moreover, it has a lock release time from 1 to 99 sec and can generate with a temperature ranges from -10°C to + 60°C.