A safety and arming device for a munition, the device comprising: a separation detector operable to generate a separation signal on detection of separation of the device from a delivery platform , wherein the separation detector comprises an electrical component capable of connection to the delivery platform , the separation detector being operable to detect an electrical characteristic of the electrical component, the electrical characteristic having a first condition when the electrical component is connected to the delivery platform and a second condition when the electrical component is not connected to the delivery platform , the separation detector being capable of distinguishing between the first and second conditions of the electrical characteristic, wherein the separation detector is operable to generate a separation signal on detection of change in the electrical characteristic from the first condition to the second condition; a free fall detector operable to generate a free fall detection signal on detection of free fall of the device for a first time period following separation, wherein the free fall detector comprises a free fall timer, operable to being initiated by a separation signal emitted in use by the separation detector , the free fall timer timing a free fall phase through which a munition , in use, is desired to free fall following separation from the delivery platform ; a roll manoeuvre detector operable to generate a roll manoeuvre detection signal on detection of a roll manoeuvre of the device for a second time period, following the first time period; and a munition firing signal generator operable to generate a munition firing signal, wherein the munition firing signal generator is operable to generate the munition firing signal on presence of all of: the separation signal, and the free fall detection signal, and the roll manoeuvre detection signal. a separation detector operable to generate a separation signal on detection of separation of the device from a delivery platform , wherein the separation detector comprises an electrical component capable of connection to the delivery platform , the separation detector being operable to detect an electrical characteristic of the electrical component, the electrical characteristic having a first condition when the electrical component is connected to the delivery platform and a second condition when the electrical component is not connected to the delivery platform , the separation detector being capable of distinguishing between the first and second conditions of the electrical characteristic, wherein the separation detector is operable to generate a separation signal on detection of change in the electrical characteristic from the first condition to the second condition; a free fall detector operable to generate a free fall detection signal on detection of free fall of the device for a first time period following separation, wherein the free fall detector comprises a free fall timer, operable to being initiated by a separation signal emitted in use by the separation detector , the free fall timer timing a free fall phase through which a munition , in use, is desired to free fall following separation from the delivery platform ; a roll manoeuvre detector operable to generate a roll manoeuvre detection signal on detection of a roll manoeuvre of the device for a second time period, following the first time period; and a munition firing signal generator operable to generate a munition firing signal, wherein the munition firing signal generator is operable to generate the munition firing signal on presence of all of: the separation signal, and the free fall detection signal, and the roll manoeuvre detection signal. the separation signal, and the free fall detection signal, and the roll manoeuvre detection signal. <EOS>