Five identical ‘Lockdown’ Pushbutton Desk Units designed and manufactured to aid in the defence of a building under attack.

Each sloping faced desk unit had three pairs of coloured pushbuttons, Blue, Yellow and Red for 1st, 2nd and 3rd Stage attacks.

All pushbuttons were momentary action with each pair wired in parallel. Wiring in this manner meaning that both buttons had to be pressed at the same time to change the state of the contact for each Stage.

To ensure that the pushbuttons could not be accidently pressed each pair had a clear Perspex cover which were required to be lifted up before the buttons could be pressed.

The Desk Units did not house any control electronics, pushbuttons where required to be terminated to an existing system.