An electronic door lock comprising: a locking mechanism configured to change a state of a door between a locked state and an unlocked state; a communications interface configured to communicate wirelessly or wired with one or more fire devices (106a, 106b, 106c, 106d), wherein the one of more fire devices are configured to transmit a wireless or wired alert signal to the communications interface in response to detecting an occurrence of fire; characterized in that the electronic door lock further comprises: an embedded RFID or NFC reader configured to read one or more RFID or NFC enabled door keys and to activate the locking mechanism to change the state of the door; and a display unit wherein the display unit includes one or more light-emitting diodes (LEDs) (214, 216) and the display unit is configured to: display an alert by emitting a first color, via the one or more LEDs, upon the communications interface receiving the wireless or wired alert signal from the one or more fire devices; and display an indication as to occupancy of the room by emitting a second color via the one or more LEDs, wherein the indication is displayed based at least in part on the reading of one or more RFID or NFC enabled keys, wherein the second color is emitted only if (a) the communications interface receives the wireless or wired alert signal and (b) the room is detected as being occupied. a locking mechanism configured to change a state of a door between a locked state and an unlocked state; a communications interface configured to communicate wirelessly or wired with one or more fire devices (106a, 106b, 106c, 106d), wherein the one of more fire devices are configured to transmit a wireless or wired alert signal to the communications interface in response to detecting an occurrence of fire; characterized in that the electronic door lock further comprises: an embedded RFID or NFC reader configured to read one or more RFID or NFC enabled door keys and to activate the locking mechanism to change the state of the door; and a display unit wherein the display unit includes one or more light-emitting diodes (LEDs) (214, 216) and the display unit is configured to: display an alert by emitting a first color, via the one or more LEDs, upon the communications interface receiving the wireless or wired alert signal from the one or more fire devices; and display an indication as to occupancy of the room by emitting a second color via the one or more LEDs, wherein the indication is displayed based at least in part on the reading of one or more RFID or NFC enabled keys, wherein the second color is emitted only if (a) the communications interface receives the wireless or wired alert signal and (b) the room is detected as being occupied. an embedded RFID or NFC reader configured to read one or more RFID or NFC enabled door keys and to activate the locking mechanism to change the state of the door; and a display unit wherein the display unit includes one or more light-emitting diodes (LEDs) (214, 216) and the display unit is configured to: display an alert by emitting a first color, via the one or more LEDs, upon the communications interface receiving the wireless or wired alert signal from the one or more fire devices; and display an indication as to occupancy of the room by emitting a second color via the one or more LEDs, wherein the indication is displayed based at least in part on the reading of one or more RFID or NFC enabled keys, wherein the second color is emitted only if (a) the communications interface receives the wireless or wired alert signal and (b) the room is detected as being occupied. display an alert by emitting a first color, via the one or more LEDs, upon the communications interface receiving the wireless or wired alert signal from the one or more fire devices; and display an indication as to occupancy of the room by emitting a second color via the one or more LEDs, wherein the indication is displayed based at least in part on the reading of one or more RFID or NFC enabled keys, wherein the second color is emitted only if (a) the communications interface receives the wireless or wired alert signal and (b) the room is detected as being occupied.