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.